Chemistry · May / June 2024 · Paper 12 · Question 8
5070Relative masses of atoms and molecules
Which statement is correct?
- AIf the relative formula mass of hydrated sodium carbonate, Na2CO3•xH2O, is 286, then x is 10.
- BPhosphoric(V) acid, H3PO4, has a relative molecular mass of 50.
- CThe relative atomic mass of a sample of an element with isotopes of masses 20 and 22 can only be equal to 21.
- DThe relative atomic mass of an element is the average mass of atoms of isotopes of the element compared with the mass of a hydrogen atom.
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Correct answer: A. If the relative formula mass of hydrated sodium carbonate, Na2CO3•xH2O, is 286, then x is 10.
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