Answer: 64.6% of Br and 35.4% of Sr Explanation: The percentage composition is obtained defining the percentage in mass of each atom in a molecule. To solve this question we must find the mass of each atom in 1 mole: Molar mass Br: 79.904g/mol Molar mass Sr: 87.62g/mol The molar mass of SrBr2 is: 79.904g/mol*2 + 87.62g/mol = 159.808g/mol + 87.62g/mol = 247.428g/mol The percentage of Br is: 79.904g/mol*2 = 159.808g/mol / 247.428g/mol * 100 = 64.6% of Br And percentage of Sr is: 87.62g/mol / 247.428g/mol * 100 = 35.4% of Sr Log in to Reply

Answer:64.6% of Br and 35.4% of Sr

Explanation:The percentage composition is obtained defining the percentage in mass of each atom in a molecule.

To solve this question we must find the mass of each atom in 1 mole:

Molar mass Br: 79.904g/molMolar mass Sr: 87.62g/molThe molar mass of SrBr2 is:

79.904g/mol*2 + 87.62g/mol =

159.808g/mol + 87.62g/mol =

247.428g/mol

The percentage of Br is:

79.904g/mol*2 = 159.808g/mol / 247.428g/mol * 100

=

64.6% of BrAnd percentage of Sr is:

87.62g/mol / 247.428g/mol * 100

=

35.4% of Sr