Question: Calculate the mass of magnesium chloride you would need to dissolve in 4dm³ of water to
make a 0.9g/dm³ solution.
Answer:
3.6 g
Explanation:
From the question,
Density of magnesium (D) = Mass of magnesium (m)/Volume of magnesium(V)
D = m/V............... Equation 1
Make m the subject of the equation
m = D×V............. Equation 2
Given: D = 0.9 g/dm³, v = 4 dm³
Substitute these values into equation 2
m = 0.9×4
m = 3.6 g.
Hence the mass of magnesium is 3.6 g.
