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chemistry question

Can anyone work this out?
About 60 million tonnes of calcium oxide is made in Britain each year.
Calculate the mass of calcium carbonate needed to make this amount of calcium oxide.
I got 33.6 million tonnes but don' know if that's right
Looks wrong, you should need more CaCO3 than CaO
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Avatar for JRM3PM
JRM3PM
8
mr of Calcium Carbonate = 40 + 12 + 3(16) =100
mr of Calcium Oxide = 40 + 16 = 56
100/56 = 1.79
1.79*60 = 107

107 million tonnes.
Original post by JRM3PM
mr of Calcium Carbonate = 40 + 12 + 3(16) =100
mr of Calcium Oxide = 40 + 16 = 56
100/56 = 1.79
1.79*60 = 107

107 million tonnes.

hi ik this was 6 years ago but i just did this in a exam and calculated the wrong mr: how many marks will i get for this (out of 5)
moles=mass/mr
=60000000000/56=1071428571
1071428571*88 (ik this is wrong but this is what i did)=9.4285x10 to the power of 10
/ 1 million tonnes= 94 million tonnes.
How many marks would i get???

Im so annoyed as i could have got this correct

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