Chemistry calculation

Calculate the concentration, in g dm-3 for:
0.500 mol of HNO3 in 200cm3 of solution.

The answer in the book is 157.5 g dm-3 but I don't understand how it got there.
Any help would be appreciated thanks!

Reply 1

username3508094

6

It looks like it's just a stylised conversion question:

1) calculate mass of HNO3 in g
2) convert 200cm3 to dm3
3) divide one by the other to get concentration

Does that help? :smile:

Reply 2

mansnothot

15

0.500 divide by 200/1000. converting from mol to g multiply by molar mass of HNO3 which is 63.

Reply 3

RP990

15

Original post by catlol

Calculate the concentration, in g dm-3 for:
0.500 mol of HNO3 in 200cm3 of solution.

The answer in the book is 157.5 g dm-3 but I don't understand how it got there.
Any help would be appreciated thanks!

n=cv
c=n/v

convert volume to dm3, so 200/1000 = 0.2

0.5/0.2= 2.5

now to convert from mol/dm3 to g/dm3, you simply multiply the answer by its molecular mass.

HN03 MR-= 1+14+(16x3)= 63

2.5 x 63 = 157.5

Reply 4

catlol

OP

10

Thank you everyone. I forgot that I needed to multiply by the molecular mass. :smile:

Reply 5

batlanang

1

Original post by catlol

Calculate the concentration, in g dm-3 for:
0.500 mol of HNO3 in 200cm3 of solution.

The answer in the book is 157.5 g dm-3 but I don't understand how it got there.
Any help would be appreciated thanks!

can u pliz show ur working

Chemistry calculation

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