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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 (...
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Answered by Joshua H. • Chemistry tutor
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0.250 g of a hydrocarbon known to contain carbon, hydrogen and oxygen was subject to complete combustion and produced 0.3664 g of CO2 and 0.1500 g of H2O. What is the empirical formula of this hydrocarbon?

The first step here is to determine the mass of C in CO 2 and the mass of H in H 2 O. This is done by dividing the relative atomic mass, Mr, by the relative molecular mass of the compound, M CO2 or M H2O , a...
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Answered by Joshua H. • Chemistry tutor
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1.5 g of hydrocarbon undergoes complete combustion to give 4.4 g of CO2 and 2.7 g of H2O. Given this data, what is the empirical formula of this hydrocarbon?

The first step here is to determine the mass of C in CO 2 and the mass of H in H 2 O. This is done by dividing the atomic mass by the molecular mass and then multiplying by the mass of compound produced. For...
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Answered by Joshua H. • Chemistry tutor
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How do I approach a question where I need to analyse the effectiveness of a 20th century leader like President Johnson's presidency?

You need to set out the leader in question's initial aims and whether these aims were met in their policies. Make sure that you set out a clear argument in your introduction and continue to develop this in t...
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Answered by Charlotte M. • History tutor
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