What are Two Reasons why the percent composition of Zn(No3)2 plus 2 KOH Zn(OH)2 plus 2 KNo3 is not 100?

What are Two Reasons why the percent composition of Zn(No3)2 plus 2 KOH Zn(OH)2 plus 2 KNo3 is not 100?
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Your question is not clear: the mass of products is equal to the mass reactants.
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Description : Identify the type of reaction(s) in the following equations. (i)CH4 + 2O2 CO2 + 2 H2O (ii) Pb(NO3)2 + 2KI ——–>Pbl2 + 2KNOs (iii) CaO + H2O ——–> Ca(OH)2 (iv) CuSO4 + Zn ——–> ZnSO4 + Cu -Chemistry

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Copper substances when exposed to air gains a green coating due to the formation of: (1) CuO (2) CuCO3 Cu(OH)2 (3) CuSO4 (4) Cu(NO3)2

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Last Answer : (2) CuCO3 Cu(OH)2 Explanation: When copper is exposed to air, it reacts with moist carbon dioxide in the air and slowly loses its shiny brown surface and gains a green coat. This green substance is ... Cu(OH)2). The formation of this green coating on the surface of a copper object corrodes it.

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