Chemistry
Grade-8
Easy
Question
In the chemical reaction AB → A + B reactant AB has 25 g and product B has 14 g. How many grams should product A have?
- 5 grams
- 7 grams
- 9 grams
- 11 grams
Hint:
The mass of reactants and products is the same.
The correct answer is: 11 grams
- The reaction AB → A + B is a representation of the law of conservation of mass.
- According to this law, the mass of reactants = mass of products
Given,
AB= 25g
B= 14g
substituting in the reaction,
25g= A + 14g
A= 25-14
A= 11g
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