Question

1. according to the law of conservation of mass, how much mass does the zinc have in this equation?

a. 40 g
b. 88 g
c. 104 g
d. 256 g

1. which box contains only elements?

a. box a
b. box b
c. box c
d. box d

Explanation:

Step1: Apply the law of conservation of mass

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. So, the mass of reactants equals the mass of products.
The mass of reactants is \(64\space g+ 192\space g\).
The mass of products is \(152\space g + x\space g\) (where \(x\) is the mass of \(Zn\)).
Set up the equation: \(64 + 192=152+x\).

Step2: Solve the equation for \(x\)

First, calculate the left - hand side of the equation: \(64 + 192=256\).
So, the equation becomes \(256 = 152+x\).
Subtract \(152\) from both sides: \(x=256 - 152\).
\(x = 104\space g\).

Answer:

C. \(104\space g\)