What mass of magnesium is necessary to make 10.5 g of magnesium bromide if 1.04 g of magnesium makes 7.88 g of magnesium bromide?
A)1.39 g
B)79.9 g
C)1.58 g
D)3.66 g
E)7.89 g

Question

Quizplus · Accepted Answer

The mass of magnesium needed is found by setting up a proportion based on the given relationship: $1.04 \, \text{g Mg} : 7.88 \, \text{g MgBr}_2 = x \, \text{g Mg} : 10.5 \, \text{g MgBr}_2$. Solving for $x$ gives $x = \frac{1.04 \times 10.5}{7.88} = 1.39 \, \text{g}$.

What Mass of Magnesium Is Necessary to Make 10