Question

How many grams of calcium sulfate, CaSO4, are in 0.300 00 mol? Assume
MCaSO4 = 136.1406 g/mol.
a. 40.842 g
b. 135.84 g
c. 0.00222 g
d. 136.44 g

Answer 1

Given:

• Number of moles = 0.3 mol
• Molar mass of CaSO₄ = 136.1406 g/mol

To find:

• Mass of Calcium Sulphate (CaSO₄) = ?

Solution:

In order to solve this question, we apply the formula:

$\pink{\sf{Number \: of \: moles = \dfrac{Mass \: of \: compound}{Molar \: mass}}}$

$\hookrightarrow \: \sf{0.3 = \dfrac{Mass\: of \: compound}{136.1406}}$

$\hookrightarrow \: \sf{Mass \: of \: Compound = 0.3 \times 136.1406}$

$\hookrightarrow \: \sf{Mass \: of \: Compound = 40.84g}$

$\therefore \boxed{\red{\bf{Mass \: of \: CaSO_4=40.84 \:grams}}}$

KNOW MORE:

• Molarity is equal to the Number of moles of solute divided by Volume of Solution in litres.