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What mass of chromium (cr) is contained in 35.8 g of (nh4)2cr2o7 ?
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May 10, 2018
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What mass of chromium (cr) is contained in 35.8 g of (nh4)2cr2o7 ?
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Mohan Seth
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M{(NH₄)₂Cr₂O₇}=2A(N)+8A(H)+2A(Cr)+7A(O)
M{(NH₄)₂Cr₂O₇}=252.065 g/mol
M(Cr)=51.996 g/mol
m{(NH₄)₂Cr₂O₇}/M{(NH₄)₂Cr₂O₇}=m(Cr)/2M(Cr)
m(Cr)=2M(Cr)m{(NH₄)₂Cr₂O₇}/M{(NH₄)₂Cr₂O₇}
m(Cr)=2*51.996*35.8/252.065=14.770 g
m(Cr)=14.770 g
Marc Gibbons
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May 15, 2018
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