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Hydrogen sulfide, H2S has a molar mass of  34.08088g/mol.
N.B. the 64.130 value is the weight of two sulfurs. Problem #3: A compound is found to have the formula XBr2, in which X is an unknown element. Bromine is found to be 71.55% of the compound. Determine the identity of X. Solution #1: 1) Determine molar mass of XBr2. 159.808 is to 0.7155 as x is to 1.