Question

There are two reactants in a chemical equation, and one product. The mass of the product is 30g. The mass of the first reactant is 17g. What must the mass of the second reactant be, if the equation is to follow the law of conservation of mass?

Select one:

A. 47g

B. 27g

C. 13g

D. 40g

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Answer 1

Given:

There are two reactants in a chemical equation

The mass of the product is 30g

The mass of the first reactant is 17g

Find mass of second reactant=?

Solution are

30 - 17 = 13g

The correct option is "c"

Hence the  mass of second reactant is 13g