Question

The compound mgso4, epsom salts, is used to soothe sore feet and muscles. how many grams will you need to prepare a bath containing 5.40 mol of epsom salts?

Answer 1

Answer: Mass= n x molar mass= 4.00 moles x 120.4 g/mol = 482 g

Explanation:

number of moles = mass/ molar mass

Answer 2

Answer:

648 grams of epsom salt will be needed.

Explanation:

Mass of magnesium atom = 24  g/mol

Mass of sulfur atom= 32 g/mol

Mass of oxygen atom= 16 g/mol

Molar mass of epsom salt: $24 g/mol+32 g/mol+4\times 16 g/mol=120 g/mol$

Moles of epsom salt in water = 5.40 mol

Mass of 5.40 moles of  epsom salt : Molar mass × Moles:

=$120 g/mol\times 5.40 mol=648 g$

648 grams of epsom salt will be needed.