Question

law of conservation of mass worksheet

1. define the law of conservation of mass.
2. according to the loco mass, the mass of reactants and products are
3. use the law of conservation of mass to fill out the missing information in the table below. mass of reactants = mass of products

Explanation:

Step1: Apply the law of conservation of mass

The law states that the mass of reactants equals the mass of products. For each reaction, sum the masses of reactants (if products are known) or sum the masses of products (if reactants are known).

Reaction A

Sum of reactant masses: \(3.4g + 10g=13.4g\)

Reaction B

Sum of reactant masses: \(12.2g + 14g = 26.2g\). Let the mass of \(CO_{2}\) be \(x\). Then \(x+20.0g=26.2g\), so \(x = 26.2g-20.0g = 6.2g\)

Reaction C

Let the mass of \(Hg\) be \(y\). Then \(y + 13.0g=23.6g\), so \(y=23.6g - 13.0g=10.6g\)

Reaction D

Let the mass of \(Li\) be \(z\). Then \(z+2.85g = 12.3g\), so \(z=12.3g - 2.85g = 9.45g\)

Reaction E

Sum of reactant masses: \(37.8g+22.2g = 60g\). Let the mass of \(CO_{2}\) be \(m\). Then \(m + 31.2g=60g\), so \(m=60g - 31.2g=28.8g\)

Reaction F

Sum of product masses: \(87.2g+38.8g = 126g\)

Reaction G

Sum of product masses: \(18.75g+9.90g = 28.65g\). Let the mass of \(NaOH\) be \(n\). Then \(14.35g + n=28.65g\), so \(n=28.65g - 14.35g=14.3g\)

Answer:

A) \(13.4g\)
B) \(6.2g\)
C) \(10.6g\)
D) \(9.45g\)
E) \(28.8g\)
F) \(126g\)
G) \(14.3g\)