Х Determine the number of grams of MgBr2 in 2.5 x 1019 molecules of MgBr2. (Atomic
weight of Mg = 24.31 and Br = 79.91).
=
Note: 10^-2 means 10-2
O 4.6 x 10^21
O 7.6 x 10^-3 g
O 8.2 x 10^40
0 4.2 x 10^-5
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Asample of hydrated tin (ii) chloride (sncl2) has a mass of 4.90 g. when it is dehydrated, it has a mass of 4.10 g. which is the correct chemical formula for the hydrate? sncl2•2h2o          sncl2•4h2o          sncl2•6h2o