Question

Magnesium hydroxide is 54.87% oxygen by mass. How much oxygen is in 118 g of the compound?
Answer in units of g

Answer 1

Magnesium hydroxide is 54.87% oxygen by mass. How much oxygen is in 118 g of the compound?

Answer in units of g

Solution

If the mass of oxygen is 54.87% from mass magnesium hydroxide, 118 g of compound contain

$$118\mathrm{g}\cdot 0.5487 = 64.747\mathrm{g}$$

of oxygen

Answer: 64.747g