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The relative formula mass of CaO is 56 and the relative formula mass of CO2 is 44. What is the mass of CaO that can be obtained from 200 g of CaCO3. CaO3 -> CaO + CO2

We are given the relative formula mass (RFM) of CaO and CO 2 , we should therefore calculate the RFM of CaO 3 : RFM of CaCO 3 = 40 + 12 + (16 x 3) = 100 If we look at the reaction in the question, we can see...
JH
Answered by Joshua H. • Chemistry tutor
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What is the relative formula mass of CaCO3?

The relative formula mass (RFM) is simply just a sum of the atomic masses that make up the compound in question. Ca = 40 C = 12 O = 16 RFM of CaCO 3 = 40 + 12 + (16 x 3) = 100 Note we have three oxygens so w...
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Answered by Joshua H. • Chemistry tutor
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24 g of Magnesium reacts with 16 g of Oxygen to produce 40 g of magnesium oxide. What mass of magnesium would you need to produce 10 g of magnesium oxide?

There are two ways to work this out, one is a lot simpler than the other, I will post the simpler method here. The relative formula mass of magnesium oxide, MgO (40), is just a sum of the mass of magnesium (...
JH
Answered by Joshua H. • Chemistry tutor
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Give an example of a strong acid.

Hydrochloric acid is an example of a strong acid because it is completely ionised in water.
MK
Answered by Maria K. • Chemistry tutor
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What exactly is a mole of something?

The best way to think of a mole is the same way you would consider a dozen to be 12 but in this case a mole is 6.2 x 10 23 molecules. You can use moles to work out the mass of a substance needed or produced ...
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Answered by Thomas N. • Chemistry tutor
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