0417 mol
Mass of benzene in kg = 75 g/1000 g kg–1 = 75 × 10–3 kg
Molality of C2H4O2 = 
2
4
2
Moles of C H O
kg of benzene
 = 
1
0 0417 mol
1000 g kg
 
75 g 
−
×
                            = 0 556 mol kg–1
Intext Questions
Intext Questions
Intext Questions
Intext Questions
Intext Questions
1 1 Calculate the mass percentage of benzene (C6H6) and carbon
tetrachloride (CCl4) if 22 g of benzene is dissolved in 122 g of
carbon tetrachloride