Which statement below correctly identifies the number of subatomic particles inside and outside the nucleus of an argon atom?
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The chemical equation representing the reaction between baking soda and acetic acid :
According to the Law of conservation of mass, the overall mass is conserved in a chemical reaction. That is total mass of reactants is equal to the mass of the products.
Given here Mass of Baking soda = 15 g
Mass of acetic acid = 10 g
Total mass of the reactants = 15 g +10 g = 25 g
After the reaction, total mass of products = 23 g
This difference in masses must be because one of product carbon dioxide is a gas, which is lost and hence the mass of products is lower than the mass of reactants. Therefore, the mass is conserved in this reaction.
According to law of conservation of mass, mass can neither be destroyed nor created in a chemical reaction. Thus, sum of masses of reactants must be equal to sum of masses of products in a reaction.
The chemical reaction is as follows:
Here, sum of masses of Cu and oxygen gas should be equal to CuO formed.
Thus, mass of oxygen will be:
This can be further proved as follows:
The balanced chemical reaction is as follows:
Here, 2 moles of Cu completely reacts with 1 mole of to give 2 moles of
.
Thus, 1 mole of Cu reacts with 0.5 moles of .
The mass of Cu is 508.4 and molar mass is 63.546 g/mol, number of moles can be calculated as follows:
Thus, number of moles of reacting will be:
Molar mass of oxygen molecule is 32 g/mol thus, mass can be calculated as follows:
m=n×M=4 mol×32 g/mol=128 g/mol
This satisfies the law of conservation of mass.