# chemistry

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#1
Can someone help me with this question:
The student made 250 cm3 of a solution of citric acid of concentration 0.0500 mol/dm3
Calculate the mass of citric acid (C6H8O7) required.
Relative atomic masses (Ar): H = 1 C = 12 O = 16

I know you cant tell me the exact answer im just confused because its calculating mass instead of concentration. do i need to calculate moles?
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1 month ago
#2

Then you have moles and Mr, so mass = Mr x Moles
(Mr Moles is how I remember that equation xD)
1
1 month ago
#3
Also, be careful with your units!!!!
0
1 month ago
#4
(Original post by Elisabeth3210)
Can someone help me with this question:
The student made 250 cm3 of a solution of citric acid of concentration 0.0500 mol/dm3
Calculate the mass of citric acid (C6H8O7) required.
Relative atomic masses (Ar): H = 1 C = 12 O = 16

I know you cant tell me the exact answer im just confused because its calculating mass instead of concentration. do i need to calculate moles?
n(C6H8O7) = 0.0500 mol/dm3 * 250/1000 dm3
Then multiply this value by the molecular mass (6*12 + 8*1 + 16*7)
0
1 month ago
#5
try looking here, it may help with this type of calculation
https://www.science-revision.co.uk/c...solutions.html
Last edited by scimus63; 1 month ago
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