Chemical quantities (AS)

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The question 'How much?' is very important to chemists. When making something by chemical synthesis, chemists need to be able to work out how much of the reactants to use and how much product they will get. As analysts chemists use their skills to work out how much of each element or compound is present in a sample.
 
Part of the chemists 'toolkit' is the ability to carry out chemical calculations from formulae and equations and to be able to interpret titration results.

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Tutorials

• Sorted FAQs on Chemical Quantities (AS)
• Calculating volumes of gases
• Calculating reacting masses from balanced equations
• An unimaginably large number

Webguides

• Titration calculations

Recently Asked Questions

• If you heat 3.970 g of a mixture of Fe₃O₄ and FeO to form 4.195 g of Fe₂O₃, what is the mass percent of FeO originally in the mixture? 260308
• 2 g of a particular organic compound was completely burnt in a plentiful supply of air. On analysis of the products of combustion, it was found that 2.74 g of carbon dioxide and 2.24 g of water were formed, with no other products. How do you calculate the percentage by mass of carbon and hydrogen in this organic compound? What other element must have been present?
• You said "Your method should involve measurements of the gas produced in the reaction and you need to calculate the amount of acid needed to be in excess." I don't how to do this. The equation would be Mg (s) + 2HCl(aq) ->MgCl₂(aq)+ H₂(g)....that's a 1:2 reaction, if I'm right? But where do I go from there in my calculations? 210208

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Tests

• Chemical quantities (AS)
• Solutions and titrations (AS)

updated: 21 August 2003