AS Chemistry 0.0 / 5 ? ChemistryCalculationsASEdexcel Created by: lwallCreated on: 22-02-14 18:35 What is mass number ? The total number of protons and neutrons in a nucleus 1 of 8 What is atomic number ? The number of protons in the nucleus. All atoms of the same element will have the same atomic number. 2 of 8 What is an isotope ? Atoms of the same element with the same number of protons but different numbers of neutrons 3 of 8 What is relative atomic mass ? The average mass of an atom of an element on a scale where an atom of carbon-12 is 12 4 of 8 What is relative isotopic mass ? The mass of an atom of an isotope of an element on a scale where an atom of carbon-12 is 12 5 of 8 How many molecules are there in one mole of ethane ? Moles=number of particles you have/number of particles in a mole. Number of particles in a mole is 6x10[23] (Avogadro Constant) 6 of 8 How do you calculate the number of mole of an element ? Moles=mass/Mr 7 of 8 What mass of NaOH needs to be dissolved in 50cm3 water to make a 2 mol-1 solution ? Mole=concxvol 8 of 8
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