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To calculate moles use the eq'n

moles = mass(g) / Mr (Relative molceular Mass).

We have a mass of 135 g

The Mr is calcualted from the Periodic Table, using atomic weights/masses.

HBr =

1 x H = 1 x 1 = 1

1 x Br = 1 x 79.9 = 79.9

79.9 + 1 = 80.9

Substituting into the eq'n

moles(HBr) = 135 / 80.9

Moles = 1.66872..... ~ 1.67 moles.

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lenpollock

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4mo ago

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