Which compound has the highest precent composition by mass of strontium?
A) SrCl2
B) SrI2
C) SrO
D) SrS

Question

07-04-2016
Chemistry

contestada

Which compound has the highest precent composition by mass of strontium?
A) SrCl2
B) SrI2
C) SrO
D) SrS

Respuesta :

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rockingholly24 rockingholly24 · Answer 1 · 2016-04-07T08:31:18+02:00

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

Which compound has the highest precent composition by mass of strontium? A) SrCl2 B) SrI2 C) SrO D) SrS

Respuesta :

Otras preguntas

Which compound has the highest precent composition by mass of strontium?
A) SrCl2
B) SrI2
C) SrO
D) SrS