# Unit 4-1 Percent Composition and Molar Mass

[qwiz qrecord_id=”aglimme-Unit4-1″]

[q]Calculate the molar mass of SO2.

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[q]Calculate the molar mass of PbCl4

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[q]Calculate the molar mass of Sn(SO4)2.

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[q labels=”bottom”]Set up the calculation to find out how many moles of SiCl4 are in 56.5g of SiCl4.

[l]56.5g SiCl4

[fx] The value given in the problem is your starting numbers.

[f*] Great!

[l]1 mol SiCl4

[fx] What you are trying to find goes on the top of the ratio.

[f*] Good!

[l]169.89g SiCl4

[fx] The molar mass goes on the bottom of the ratio.

[f*] Correct!

[q labels=”bottom”]Set up the calculation to find out how many grams of SnI2 are in 0.56moles of SnI2.

[l]0.56mol SnI2

[fx] The value given in the problem is your starting numbers.

[f*] Good!

[l]1mol SnI2

[fx] Since we are starting with moles the 1 mol value goes on the bottom.

[f*] Great!

[l]372.51g SnI2

[fx] What you are trying to find goes on the top of the ratio.

[f*] Great!

[q]How many grams of K2O are in 0.875 moles of K2O?

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[q]How many moles of Al(NO3)3 are in 102.6g of Al(NO3)3?

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[q]Calculate the mass percent of nitrogen in 1 mole of N2O5.

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[/qwiz]