Molality (1 Viewer)

[lilchezza]

Commercial 0.100M nitric acid is labelled as having a density of 1.005 g/mL. Take molar mass of nitric acid = 61 g/mol. The molality of the solution is:

a) 0.102 m
b) 0.101 m
c) 0.100 m
d) 0.0950 m
e) 0.103 m

 

[hg83ry]

wow, i dont know how to do that

 

[brenton1987]

Commercial 0.100M nitric acid is labelled as having a density of 1.005 g/mL. Take molar mass of nitric acid = 61 g/mol. The molality of the solution is:

It will depend on the density of water. Molality is moles per kilogram of solvent, so assuming the density of water is 1 g/mL (Water density changes with temperature and TDS but you didnt give those numbers) 1 L = 1 kg.
0.100 M HNO3 = 0.100 m HNO3

wow, i dont know how to do that

It doesnt surprise me seeing how youre doing your HSC this year.