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4.3 Quantitative chemistry

Quick questions on Conservation of mass and the mole - AQA GCSE Chemistry

3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is q1?
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Calculate the relative formula mass of H2OH_2O (ArA_r: H = 1, O = 16). [1 mark]
What is q2?
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Explain why the mass of a metal increases when it burns in air in an open dish. [2 marks]
What is q3?
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Calculate the relative formula mass of magnesium nitrate, Mg(NO3)2Mg(NO_3)_2 (ArA_r: Mg = 24, N = 14, O = 16). [2 marks]

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