First find the molar masses of all of the compounds: SrCl2 = 158.53g/mol SrI2 = 341.43g/mol SrO = 103.62g/mol SrS = 119.68g/mo
Then find the molar mass of Sr in each of the compounds. Since there is only one Sr in every compound, the mass will be the same: 87.62g/mol Sr
Now divide the molar mass of Sr by each of compounds' masses: SrCl2 = (87.62)/(158.53) = 0.553 SrI2 = (87.62)/(341.43) = 0.257 SrO = (87.62)/(103.62) = 0.846 SrS = (87.62)/(119.68) = 0.732
Now multiply each of the results by 100 to get the percent composition of Sr by mass: (0.553)(100) = 55.3% Sr in SrCl2 (0.257)(100) = 25.7% Sr in SrI2 (0.846)(100) = 84.6% Sr in SrO (0.732)(100) = 73.2% Sr in SrS
Thus SrO has the highest percent composition by mass of Sr
The answer is B. This is because Sodium has 1 valence electron and Fluorine has 7 valence electrons. All elements want 8 valence electrons so they may be stale, like the noble gases are. Hope this helps.
