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Urgent !!!!!!!!!!!!!!!! plzzzzzzzz chem ATP
- Thread starter Aathi
- Start date
- Messages
- 69
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- 16
Q1,c,vi-- Air : O2
100cm3: 20cm3
x : 30 cm3
x= 3000/20 = 150 cm3
Q8,b,ii-- 1.32 grms of sodium carbonate are dissolved in 250 cm3
Volume : mass dissolved
250 : 1.32
1000: x
x=5.28 grms in 1000 cm3 ( 1 dm3 )
n= mass/Mr
5.28/106 = 0.0498 moles/dm3
Hope that helps!
100cm3: 20cm3
x : 30 cm3
x= 3000/20 = 150 cm3
Q8,b,ii-- 1.32 grms of sodium carbonate are dissolved in 250 cm3
Volume : mass dissolved
250 : 1.32
1000: x
x=5.28 grms in 1000 cm3 ( 1 dm3 )
n= mass/Mr
5.28/106 = 0.0498 moles/dm3
Hope that helps!