C. Sometimes
they can have various benefits but some genetic mutations can cause disadvantages
Use a calculator to plug in the different numbers to the equations
I believe the answer is A.
mass of the gas = 10 g
<h3>Further explanation</h3>
<em>The law of conservation of mass :</em>
<em>In a closed / isolated system, the total mass of the substance before the reaction will be equal to the total mass of the reaction product.</em>
Reaction

mass before reaction=mass after reaction
