Question

100 g of mercuric oxide decomposes to produce oxygen of oxygen (o) and mercury (hg) in a chemical reaction. according to the law of conservation of mass, if 7 g of oxygen (o) is produced in the reaction, what is the mass of mercury (hg) in the products? (1 point)
7 g
93 g
107 g
100 g

Explanation:

Step1: Recall Law of Conservation of Mass

The Law of Conservation of Mass states that the total mass of reactants equals the total mass of products. Here, the reactant is mercuric oxide (100 g), and the products are oxygen (O) and mercury (Hg). So, \( \text{Mass of } Hg + \text{Mass of } O = \text{Mass of mercuric oxide} \).

Step2: Solve for mass of Hg

Given mass of O is 7 g and mass of mercuric oxide is 100 g. Let \( m_{Hg} \) be the mass of mercury. Then \( m_{Hg} + 7 = 100 \). Solving for \( m_{Hg} \), we get \( m_{Hg} = 100 - 7 = 93 \) g.

Answer:

93 g (corresponding to the option "93 g")