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What does relative formula mass, MrM_rMr​, add together?

A

For 4.8 g4.8\ \text{g}4.8 g Mg, 3.2 g3.2\ \text{g}3.2 g oxygen and 8.0 g8.0\ \text{g}8.0 g MgO, the coefficient ratio is 2:1:2\boxed{2:1:2}2:1:2​, giving 2Mg+O2→2MgO2\text{Mg}+\text{O}_2\rightarrow2\text{MgO}2Mg+O2​→2MgO.

B

The relative atomic masses of every atom shown in the formula.

C

Divide the compound's MrM_rMr​ by the empirical formula mass, then multiply every subscript by that whole-number multiplier.

D

0.50×6.02×1023=3.01×10230.50 \times 6.02 \times 10^{23}=\mathbf{3.01\times10^{23}}0.50×6.02×1023=3.01×1023 molecules.

Card 1 of 25

2.6 Calculations involving masses Flashcards

  1. GCSE
  2. /Chemistry
  3. /2.6 Calculations involving masses

25 flashcards on Edexcel GCSE Chemistry 2.6 Calculations involving masses: the key terms, definitions and equations you need to recall for Paper 1 and Paper 2.

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