How many moles are there in 140 g of Si (atomic mass of silicon is 28)?

How many moles are there in 140 g of Si (atomic mass of silicon is 28)?
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Estimate the number of atoms comprising a silicon chip that is 0.2 millimeters by 0.2 millimeters by 0.1 millimeters, given that the density of silicon is 2.34 grams per cubic centimeter, the number of atoms in a gram-weight is approximately 6 x 1023 atoms, and the atomic weight of silicon is 28:

Description : Estimate the number of atoms comprising a silicon chip that is 0.2 millimeters by 0.2 millimeters by 0.1 millimeters, given that the density of silicon is 2.34 grams per cubic centimeter, the number of atoms in a gram-weight is approximately 6 x 1023 atoms, and the atomic weight of silicon is 28:

Last Answer : ANSWER: 2 x 1017

In the following reaction sequence, the amount of D (in g) formed from to moles of acetophenone is.......... (Atomic weights in `g mol^(-1) : H = 1, C

Description : In the following reaction sequence, the amount of D (in g) formed from to moles of acetophenone is.......... (Atomic weights in `g mol^(-1) : H = 1, C

Last Answer : In the following reaction sequence, the amount of D (in g) formed from to moles of acetophenone ... product in each step is given in the parenthesis)

Atomic mass of Sulphur is 32u. The number of moles in 16 games of Sulphur is: (1) 1 mole of Sulphur (2) 0.5 moles of Sulphur (3) 0.75 moles of Sulphur (4) 0.25 moles of Sulphur

Description : Atomic mass of Sulphur is 32u. The number of moles in 16 games of Sulphur is: (1) 1 mole of Sulphur (2) 0.5 moles of Sulphur (3) 0.75 moles of Sulphur (4) 0.25 moles of Sulphur

Last Answer : (2) 0.5 moles of Sulphur Explanation: The molar mass of a com pound is equal to the sum of the atomic masses of its con stituent atoms in g/mol.

The sum of the mass numbers of the atoms in a molecule equals the ______, which is measured in units called _______. a. Atomic Number; Milligrams b. Mass Weight; Micrograms c. Chemical Weight; Moles d. Molecular Weight; Daltons

Description : The sum of the mass numbers of the atoms in a molecule equals the ______, which is measured in units called _______. a. Atomic Number; Milligrams b. Mass Weight; Micrograms c. Chemical Weight; Moles d. Molecular Weight; Daltons

Last Answer : d. Molecular Weight; Daltons

The gas constant of a certain gas is the ratio of:  A. Universal gas constant to molar mass  B. Universal gas constant to atomic weight  C. Universal gas constant to atomic number  D. Universal gas constant to number of moles

Description : The gas constant of a certain gas is the ratio of:  A. Universal gas constant to molar mass  B. Universal gas constant to atomic weight  C. Universal gas constant to atomic number  D. Universal gas constant to number of moles

Last Answer : Universal gas constant to molar mass

What is the relative atomic mass of silicon ?

Description : What is the relative atomic mass of silicon ?

Last Answer : Relative atomic mass of silicon 28 .

what is 200+140+40+28?

Description : what is 200+140+40+28?

Last Answer : 408

A 15-year-old girl was seen by her family physician because of increasing lethargy. She had a recent history of the "flu". Biochemistry tests show that she has renal impairement. serum sodium 140 mmol/L (137 - 144) serum potassium 4.2 mmol/L (3.5 - 4.9) serum urea 28 mol/L (2.5 - 7.5) serum creatinine 280 µmol/L (60 - 110) Her condition does not improve after several weeks on corticosteroid therapy, so a renal biopsy is performed. The biopsy demonstrates the presence of segmental sclerosis of 3 of 10 glomeruli identified in the biopsy specimen. Immunofluorescence studies and electron microscopy do not reveal evidence for immune deposits. What is the most appropriate advice to give regarding her condition? 1) She has an underlying malignancy 2) She may require a renal transplant in 10 years

Description : A 15-year-old girl was seen by her family physician because of increasing lethargy. She had a recent history of the "flu". Biochemistry tests show that she has renal impairement. ... will likely develop a restrictive lung disease 5) She will probably improve with additional corticosteroid therapy

Last Answer : Answers-2 The findings point to focal segmental glomerulosclerosis (FSGS), which leads to chronic renal failure in half of cases. The lack of resolution with corticosteroid therapy and the progression to chronic renal failure is what sets FSGS apart from minimal change disease.

1/9, 4/9, 1 7/9, 7 1/9, 28 4/9, ? a) 112(1/9) b) 113(7/9) c) 115(4/9) d) 140(5/9) e) 142(2/9)

Description : 1/9, 4/9, 1 7/9, 7 1/9, 28 4/9, ? a) 112(1/9) b) 113(7/9) c) 115(4/9) d) 140(5/9) e) 142(2/9)

Last Answer : The pattern is 1/9,4/9,16/9,64/9,256/9,1024/9. 1024/9 = 113 7/9 Answer: b)

vIf the price of Mango is Rs. 130 per kg, Apple is Rs. 140 per kg and Orange is Rs. 80 per kg, then what is the ratio of their cost at vendor A? 1) 11 : 14 : 16 2) 39 : 28: 20 3) 39 : 28 : 21 4) 15 : 14 : 11 5) 39 : 26 : 20

Description : If the price of Mango is Rs. 130 per kg, Apple is Rs. 140 per kg and Orange is Rs. 80 per kg, then what is the ratio of their cost at vendor A? 1) 11 : 14 : 16 2) 39 : 28: 20 3) 39 : 28 : 21 4) 15 : 14 : 11 5) 39 : 26 : 20

Last Answer : 2) 39 : 28: 20

Two filling tap can fill a dumper in 14 and 28 min. respectively and when the waste tap is open, they can together fill it in 35 min. The waste pipe can empty the full dumper in – A) 152/9 hrs. B) 137/7 hrs. C) 60/9 hrs. D) 140/11 hrs.

Description : Two filling tap can fill a dumper in 14 and 28 min. respectively and when the waste tap is open, they can together fill it in 35 min. The waste pipe can empty the full dumper in – A) 152/9 hrs. B) 137/7 hrs. C) 60/9 hrs. D) 140/11 hrs.

Last Answer :  D 1/14 + 1/28 – 1/35 =>10 + 5 – 4/140 =>11/140 =>140/11 => hence answer is 140/11 hours.

If the production of a factory grows at a 16% p.a., what will be its production for the year 2016 if its production in 2014 was 140 lakh tonnes? a) 222.734 b) 149.597 c) 188.384 d) 28 3.812 e) 180.534

Description : If the production of a factory grows at a 16% p.a., what will be its production for the year 2016 if its production in 2014 was 140 lakh tonnes? a) 222.734 b) 149.597 c) 188.384 d) 28 3.812 e) 180.534

Last Answer : Answer: C Required Production=140(1 + 16/100)2 lakh tones  =140(1 + 4/25)2  =140((25 + 4) /25)²  =140(29/25)²  =140(1.16)²  =140×1.3456  =188.384 lakh tonnes

The SI unit of mass  a. kg  b. g  c. N  d. None of the above

Description : The SI unit of mass  a. kg  b. g  c. N  d. None of the above

Last Answer : kg

Can a silicon nucleus `(._(14)^(31)Si)` transfrom into a phosphorus nucleus `(._(15)^(31)P)` ? What particle would be emitted in the process ? What is

Description : Can a silicon nucleus `(._(14)^(31)Si)` transfrom into a phosphorus nucleus `(._(15)^(31)P)` ? What particle would be emitted in the process ? What is

Last Answer : Can a silicon nucleus `(._(14)^(31)Si)` transfrom into a phosphorus nucleus `(._(15)^(31)P)` ? What ... = 30.97535 am u, m_(p) = 30.97376 am u`

Tunnel diode is a: a) Power diode b) Has light doping c) Has heavy doping d) Is a reverse recovery diode Ans: C 76.LEDs are fabricated from: a) Silicon b) Germanium c) Si or Ge d) Gallium arsenide

Description : Tunnel diode is a: a) Power diode b) Has light doping c) Has heavy doping d) Is a reverse recovery diode Ans: C 76.LEDs are fabricated from: a) Silicon b) Germanium c) Si or Ge d) Gallium arsenide

Last Answer : Ans: D

Presence of silicon in steel (A) Is in the form of free Si (B) Indicates that steel is not deoxidised properly(C) Decreases the blow holes formation tendency in castings(D) None of these

Description : Presence of silicon in steel (A) Is in the form of free Si (B) Indicates that steel is not deoxidised properly (C) Decreases the blow holes formation tendency in castings (D) None of these

Last Answer : (C) Decreases the blow holes formation tendency in castings

H2SO4 (< 50% concentration) is corrosive to (A) Aluminium, mild steel, stainless steel, concrete & tin (B) Copper, cast iron & high silicon iron (14% Si) (C) Rubber (butyl and hard), silicone rubber & Teflon (D) Glass, graphite, porcelain & stoneware

Description : H2SO4 (< 50% concentration) is corrosive to (A) Aluminium, mild steel, stainless steel, concrete & tin (B) Copper, cast iron & high silicon iron (14% Si) (C) Rubber (butyl and hard), silicone rubber & Teflon (D) Glass, graphite, porcelain & stoneware

Last Answer : (A) Aluminium, mild steel, stainless steel, concrete & tin

Most suitable material for high pressure vessel operating at 500 atm. and 500° C is (A) Molybdenum stainless steel(B) 18/8 stainless steel(C) Mild steel(D) High silicon iron (14% Si)

Description : Most suitable material for high pressure vessel operating at 500 atm. and 500° C is (A) Molybdenum stainless steel (B) 18/8 stainless steel (C) Mild steel (D) High silicon iron (14% Si)

Last Answer : (A) Molybdenum stainless steel

Rotary driers are generally made of (A) Cast iron (B) Mild steel (C) High silicon iron (14% Si) (D) Tin lined with refractory bricks

Description : Rotary driers are generally made of (A) Cast iron (B) Mild steel (C) High silicon iron (14% Si) (D) Tin lined with refractory bricks

Last Answer : (B) Mild steel

The 'bomb' in the bomb calorimeter is made of (A) Molybdenum stainless steel(B) Mild steel(C) High silicon iron (14% Si)(D) Copper

Description : The 'bomb' in the bomb calorimeter is made of (A) Molybdenum stainless steel (B) Mild steel (C) High silicon iron (14% Si) (D) Copper

Last Answer : (A) Molybdenum stainless steel

Copper is dissolved from its ore by H2SO4 in a percolation tank made of (A) Wood (B) Stainless steel (C) Reinforced concrete lined with lead (D) High silicon iron (14% Si)

Description : Copper is dissolved from its ore by H2SO4 in a percolation tank made of (A) Wood (B) Stainless steel (C) Reinforced concrete lined with lead (D) High silicon iron (14% Si)

Last Answer : (C) Reinforced concrete lined with lead

Carbon tetrachloride can be stored in a storage vessel made of (A) High silicon iron (14% Si) (B) Tin (C) Stainless steel (D) All (A), (B) and (C)

Description : Carbon tetrachloride can be stored in a storage vessel made of (A) High silicon iron (14% Si) (B) Tin (C) Stainless steel (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Straight silicon steel (containing Si from 0.5 to 5%) because of their low hysteresis loss and high magnetic permeability are used for electrical appliances. Which of the following electrical appliances made of silicon steel contains maximum percentage of silicon (about 4%)? (A) Armature of small motors/generators (B) Generators and small motors (C) Induction motors (D) High frequency transformers

Description : Straight silicon steel (containing Si from 0.5 to 5%) because of their low hysteresis loss and high magnetic permeability are used for electrical appliances. Which of the following electrical ... /generators (B) Generators and small motors (C) Induction motors (D) High frequency transformers

Last Answer : (D) High frequency transformers

Containers made of high silicon cast iron (14% Si) are not suitable for the storage of (A) Acetic acid (B) Benzoic & boric acids (C) Phosphoric acid (95%) & sulphuric acid (95%) (D) Hydrochloric acid (concentrated)

Description : Containers made of high silicon cast iron (14% Si) are not suitable for the storage of (A) Acetic acid (B) Benzoic & boric acids (C) Phosphoric acid (95%) & sulphuric acid (95%) (D) Hydrochloric acid (concentrated)

Last Answer : (D) Hydrochloric acid (concentrated)

A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle system (in SI units) is given below : Δ P/L = 375 × 10 3 VOM + 10.94 × 10 6 V2 OM (SI units) If water is to be used as the fluidising medium, the minimum fluidisation velocity, VOM is (A) 12 mm/s (B) 16 mm/s (C) 24 mm/s (D) 28 mm/s

Description : A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle ... fluidisation velocity, VOM is (A) 12 mm/s (B) 16 mm/s (C) 24 mm/s (D) 28 mm/s

Last Answer : (B) 16 mm/s

According to the classification of hypertension diagnosed in the older adult, hypertension that can be attributed to an underlying cause is termed a) secondary. Secondary hypertension may be caused by a tumor of the adrenal gland (e.g., pheochromacytoma). b) primary. Primary hypertension has no known underlying cause. c) essential. Essential hypertension has no known underlying cause. d) isolated systolic. Isolated systolic hypertension is demonstrated by readings in which the systolic pressure exceeds 140 mm Hg and the diastolic measurement is normal or near normal (less than 90 mm Hg).

Description : According to the classification of hypertension diagnosed in the older adult, hypertension that can be attributed to an underlying cause is termed a) secondary. Secondary hypertension may be caused by a tumor of ... mm Hg and the diastolic measurement is normal or near normal (less than 90 mm Hg).

Last Answer : a) secondary. Secondary hypertension may be caused by a tumor of the adrenal gland (e.g., pheochromacytoma).

What is the atomic number of Si ?

Description : What is the atomic number of Si ?

Last Answer : The atomic number of Si is 14

`3.011 xx 10^(22)` atoms of an element weight 1.15 g. The atomic mass of the element is :-

Description : `3.011 xx 10^(22)` atoms of an element weight 1.15 g. The atomic mass of the element is :-

Last Answer : `3.011 xx 10^(22)` atoms of an element weight 1.15 g. The atomic mass of the element is :- A. 10 amu B. 2.3 amu C. 35.5 amu D. 23 amu

For a reaction `H_(2(g))+I_(2(g))rArr2HI_((g))at 721^(@)C` the value of equilibrium constant is 50 . If 0.5 moles each of `H_(2)` & `I(2)` is added to

Description : For a reaction `H_(2(g))+I_(2(g))rArr2HI_((g))at 721^(@)C` the value of equilibrium constant is 50 . If 0.5 moles each of `H_(2)` & `I(2)` is added to

Last Answer : For a reaction `H_(2(g))+I_(2(g))rArr2HI_((g))at 721^(@)C` the value of equilibrium constant is 50 . ... constant will be . A. 100 B. 25 C. 50 D. 200

When 22.4 litres of `H_(2)(g)` is mixed with 11.2 litres of `CI_(2)(g)`, eacg at STP, the moles of HCI(g) formed is equal to :-

Description : When 22.4 litres of `H_(2)(g)` is mixed with 11.2 litres of `CI_(2)(g)`, eacg at STP, the moles of HCI(g) formed is equal to :-

Last Answer : When 22.4 litres of `H_(2)(g)` is mixed with 11.2 litres of `CI_(2)(g)`, eacg at STP, the moles of HCI(g ... ) C. 1 mol of HCI (g) D. 2 mol of HCI (g)

One atom of an element x weigh `6.643 xx 10^(-23)` g. Number of moles of atom in 20 kg is :-

Description : One atom of an element x weigh `6.643 xx 10^(-23)` g. Number of moles of atom in 20 kg is :-

Last Answer : One atom of an element x weigh `6.643 xx 10^(-23)` g. Number of moles of atom in 20 kg is :- A. 4 B. 40 C. 100 D. 500

What the number of moles in 24 g of oxygen gas?

Description : What the number of moles in 24 g of oxygen gas?

Last Answer : 24 g of oxygen gas (O2) is equal to o.75 moles.

How many moles in g of Ag?

Description : How many moles in g of Ag?

Last Answer : Need answer

What is the number of moles in 24 g of oxygen gas?

Description : What is the number of moles in 24 g of oxygen gas?

Last Answer : The number of moles in 24 g of oxygen gas (O2) is 0,75.

How many moles of carbon monoxide are in 350 g sample?

Description : How many moles of carbon monoxide are in 350 g sample?

Last Answer : 350 g sample of CO contain 12,49 moles.

How many moles of MgCl2 are there in 313 g of the compound?

Description : How many moles of MgCl2 are there in 313 g of the compound?

Last Answer : Approx 3.29 moles.

In the reaction M g C I 2 plus 2 KO H - and gt MG OH 2 plus 2 K CI if 1 mole Mg CI 2 is added to 3 moles KO H what is the limiting reagent?

Description : In the reaction M g C I 2 plus 2 KO H - and gt MG OH 2 plus 2 K CI if 1 mole Mg CI 2 is added to 3 moles KO H what is the limiting reagent?

Last Answer : Feel Free to Answer

How many moles are in 16.4 g of Ca(NO3)2?

Description : How many moles are in 16.4 g of Ca(NO3)2?

Last Answer : What is the answer ?

How many moles of N are in 0.223 g of N2O?

Description : How many moles of N are in 0.223 g of N2O?

Last Answer : The number of nitrogen moles is 0,01.

What is the number of moles in 14.1 g of Fe .?

Description : What is the number of moles in 14.1 g of Fe .?

Last Answer : The number of moles in 14,1 g of Fe is 0,252.

How many moles are in 27.4 g of water?

Description : How many moles are in 27.4 g of water?

Last Answer : 27.4 g H2O x 1 mole/18 g = 1.52 moles

How many moles of atoms are in .515 g of carbon?

Description : How many moles of atoms are in .515 g of carbon?

Last Answer : 0,515 g of carbon is equal to 0,043 moles.

How many moles of iodine are produced from 560 g of magnesium iodide?

Description : How many moles of iodine are produced from 560 g of magnesium iodide?

Last Answer : not sure

What are the number of moles of CO2 which contains 16 g of oxygen?

Description : What are the number of moles of CO2 which contains 16 g of oxygen?

Last Answer : 0.5 mole

FeO (s) + CO (g) = Fe (s) + CO2 (g), k = 0. 435 at 1173E; at equilibrium, what will be the number of moles of CO gas required to reduce one mole of FeO at 1173 K? (A) 1.0 (B) 1.3 (C) 2.3 (D) 3.3

Description : FeO (s) + CO (g) = Fe (s) + CO2 (g), k = 0. 435 at 1173E; at equilibrium, what will be the number of moles of CO gas required to reduce one mole of FeO at 1173 K? (A) 1.0 (B) 1.3 (C) 2.3 (D) 3.3

Last Answer : Option D

The number of moles of sodium oxide in 620 g is [BHU 1992] (A) 1 mol (B) 10 moles (C) 18 moles (D) 100 moles

Description : The number of moles of sodium oxide in 620 g is [BHU 1992] (A) 1 mol (B) 10 moles (C) 18 moles (D) 100 moles

Last Answer : (B) 10 moles

What is the atomic number of silicon ?

Description : What is the atomic number of silicon ?

Last Answer : The atomic number of silicon is 14 .

Silicon Atomic Numbers How much ?

Description : of silicone Atomic Numbers How much ?

Last Answer : of silicone Atomic Numbers 14.

Which of the following elements has the atomic number greater than that of Phosphorus? (1) Aluminium (2) Silicon (3) Chlorine (4) Magnesium

Description : Which of the following elements has the atomic number greater than that of Phosphorus? (1) Aluminium (2) Silicon (3) Chlorine (4) Magnesium

Last Answer : (3) Chlorine Explanation: Chlorine is a chemical element with symbol Cl and atomic number 17. Phosphorus is a chemical element with symbol P and atomic number 15.

The atomic number of silicon is

Description : The atomic number of silicon is

Last Answer : 14 and its mass number is 28.