Homework Answers
A) mass % = (mass of individual element / total mass) x 100
mass % Ca = (3.55 / 7.2) x 100
mass % Ca = 49.3 %
mas % F = 100 - 49.3 = 50.7
mass % Ca , F = 49.3 , 50.7
B) (C3H5)2S = 114.21 g /mol
114.21 g (C3H5)2S contain 32 g S
15.4 g (C3H5)2S contain 15.4 x 32 / 114.21 = 4.31 g
mass of S = 4.31 g
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Express your answers using two significant figures. Enter your
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Express your answers using two significant figures. Enter your
answers numerically separated by a comma.
3)
F⃗ =(70N,47.5∘counterclockwisefrompositivey−axis)
Express your answers using two significant figures. Enter your
answers numerically separated by a comma.
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Find x- and y-components of the following
vectors.
1) v⃗ =(9.0m/s,negativey−direction)
Express your answers using two significant figures. Enter your
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2) a⃗ =(24m/s2,58∘belowpositivex−axis)
Express your answers using two significant figures. Enter your
answers numerically separated by a comma.
3)
F⃗ =(70N,47.5∘counterclockwisefrompositivey−axis)
Express your answers using two significant figures. Enter your
answers numerically separated by a comma.
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