Question

Determine the number of moles of molecules (or formula units) in each sample.

39.2g sodium chloride
28.3g nitrogen monoxide
5.00kg carbon dioxide
2.77mg carbon tetrachloride

Answer 1

no of moles of Nacl= 0.6707

no of moles of NO = 0.943

no of moles of CO2 = 113.61

no of moles of CCl4 = 0.000018

Step-by-step explanation:

To calculate moles we need know their molar mass.

for Nacl2

given mass = 39.2g

molar mass= 58.44g/mol

no of moles =given mass÷ molar mass

= 39.2÷58.44

= 0.6707 mol

for NO

no of moles =28.3÷30.01

= 0.943 mol

for CO2

no of moles = 5000÷44.01 (5kg= 5× 1000g)

= 113.61 mol

for CCl4

no of moles = 0.002÷153.82 (mg to gm)

= 0.000018 mol