Answer to Question #158835 in General Chemistry for Kimberly

Question #158835

1. Calculate the percent composition by mass of ​water in the compound CaSO​4​ • 6 H​2O​ ​ [​GFM = 244].


2​.​ Calculate the percent composition by mass of ​water in the hydrate CaCl​2 ​ • 2H​2O​ .


3. ​Calculate the percent composition by mass of water​ in the hydrate ​CuSO​4​ • 5 H​2O​ ?


4. Calculate the percent composition by mass of water​ in the hydrate CaO​ ​ • 4H​2O​ [GFM = 128]


5. ​ ​What is the percent mass concentration of 45 g of a solution containing 9.0 g of KClO​3


6 ​ A single 500.0 gram serving of one sports drink contains 0.055 grams of sodium ions. Calculate the concentration of sodium ions in this sports drink, expressed as percent by mass.


1
Expert's answer
2021-02-01T03:43:14-0500
ωH2O=M(H2O)/M(CaSO46H2O)100\omega H2O=M(H2O)/M (CaSO4*6H2O)*100 %
ωH2O=618/244100=44.26\omega H2O=6*18/244*100=44.26%

2.

ωH2O=218/147100=24.49\omega H2O=2*18/147*100=24.49 %

3.

ωH2O=518/250100=36\omega H2O=5*18/250*100=36 %

4.

ωH2O=418/128100=56.25\omega H2O=4*18/128*100=56.25 %7

5.

ωKClO3=mKClO3/m100=9/45100=20\omega KClO3=m KClO3/m*100 = 9/45 * 100=20 %

6.

ωK+=m(K+)/m100=0.055/500100=0.011\omega K+=m(K+)/m*100=0.055/500*100=0.011 %


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