Question

How many moles are there in the following samples?
(S- 32u Na- 23u Cl – 35.5 u )
a) 30 g of Sulphur molecule b) 1Kg of NaCl

Answer 1

Answer: a) sulfur 0.9375 mol

b) NaCl = 17.09 mol

Explanation:

for moles we have the formula

number of moles = (mass)/(molar mass)

so a) 30 g sulfur

sulfur has a molar mass of 32u

moles of sulfur = (30g)/(32 g/mol)

moles of sulfur = 0.9375 moles

b) 1Kg of NaCl

NaCl has a molar mass of 58.5 u

moles of NaCl = (1000 g)/(58.5 g/mol)

moles of NaCl = 17.09 mol