Calculations involving solutions 25.0 cm3 of 0.04 mol dm-3 sodium hydroxide solution reacted with 20.75 cm3 of sulphuric acid in a titration. Give the chemical equation for the reaction and find the concentration of the […]
Calculations involving solutions What volume of 0.1mol dm-3 hydrochloric acid would react with 25 g of calcium carbonate and what volume of gas would be produced? CaCO3 + 2 HCl –> CaCl2 + CO2 + H2O
Mole calculations The reaction below is known as the Thermite reaction, which is used to form molten iron to mould iron train tracks together. What mass of aluminium powder is needed to react with 8.0 […]
Mole calculations What mass of carbon monoxide is needed to react with 1 kg of iron oxide? Fe2O3 + 3 CO –> 2 Fe + 3 CO2
Empirical & Molecular Formula A compound containing carbon, hydrogen & oxygen only, contains 74.2% carbon and 7.9% hydrogen. Its Mr is found to be 178 by mass spectroscopy. Find its empirical and molecular formulae
Empirical Formula A compound contains 59.4% carbon, 10.9% hydrogen, 13.9% nitrogen and 15.8% oxygen by mass. Find the empirical formula of the compound…
Amount of substance Find the number of moles present in the following 12g Carbon12 32g Water (H2O) 50g Magnesium 100g Iron (III) Oxide (Fe2O3) 1,250 tonnes Iron (III) Oxide (Fe2O3) Find the mass of substance when […]
Merry Christmas to all Chemstuff followers! Over the next 12 days get ready for 12 christmas presents of chemical calculations (You can’t say I never treat you to anything!) Please show your working as much […]
Click on the links below to find out more: BICEP2 Discovery Neanderthals Sauropod New species Chemical bond Exoplanet with rings Archaic jawbone Ancient system With thanks to IFL science for the weekly news.
This year, I decided to do away with the traditional spruce Christmas Tree and make my own. Of course being for the chemistry lab it had to be a bit different! I wanted to make a […]
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