Question

Twenty-four grams of magnesium metal reacts with sixteen grams of oxygen gas to form magnesium oxide. According to the law of

conservation of mass, how much magnesium oxide will there be after the chemical change is complete?
A.
40 g
B.
30 g
C.
24 g
D.
16 g

Answer 1

40 g

Step-by-step explanation:

Law of conservation of mass:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

Explanation:

This law was given by french chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction

Chemical equation:

Mg + O₂ → MgO

Balanced chemical equation:

2Mg + O₂ → 2MgO

24 g + 16 g = 40 g

40 g = 40 g

according to aw of conservation of mass i=the mass of product must be equal to mass of reactant that's why product must be 40 g.