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Published byElizabeth Squires Modified about 1 year ago

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Learning Objectives: To be able to calculate M r values from A r values

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Masses of Molecules Example H 2 contains 2 x hydrogen atoms. Hydrogen atoms have a relative mass of 1, so H 2 has a relative mass of: HHHH mass = 1 mass = 1 H 2 2 x 1 = 2g

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Masses of Molecules Example CO 2 contains 1 x carbon atom and 2 x oxygen atoms. carbon atoms have a relative mass of 12, and oxygen atoms have a relative mass of 16. The sum is:(1 x 12) + (2 x 16) = = 44g COO

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Calculate the M r values of the following: N 2 Al 2 O 3 NH 3 CaCO 3 H 2 ONaNO 3 MgONH 4 NO 3 NaOHCuSO 4 Na 2 OFe 2 O 3 C 2 H 6 HNO 3 H 2 SO 4 F 2 O 28 Reset Show instructions Hide instructions Click on compounds to reveal answer Click on the large Periodic Table to shrink it Click on the Periodic Table to enlarge it

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Extension Activity (find the Mr of these compounds) Mg(OH) 2 (NH 4 ) 2 SO 4 Fe(OH) 3 1 x Mg + 2 x O + 2 x H = 24 + (2 x 16) + (2 x 1) = 58 1 x Fe + 3 x O + 3 x H = 56 + (3 x 16) + (3 x 1) = x N + 8 x H + 1 x S +4 x O = (2 x 14) + (8 x 1) (4 x 16) = 132 Show Answer

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