Molality Worksheet With Answers Page 2
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2Molality wksht p. 2
9. A solution of MgBr
is 1.40 m. What is the molality of bromide ions in solution?
2
10. What is the molality of ions in solution if 2.0 moles of Al(NO
)
is added to 2.5 kg of water?
3
3
11. How many moles of ions are dissolved in 0.75 kg of water when the concentration of (NH
)
PO
is
4
3
4
0.40 m?
12. A solution of Ca(NO
)
must be 2.00 m in ions. What mass of Ca(NO
)
must be added to 125 g of
3
2
3
2
water to make this solution?
13. 32.0 g of NaOH is added to water to make 500. g of solution. What is the molality?
Answers: 8) 0.37 m 9) 2.80 m 10) 3.2 m 11) 1.2 mol 12) 13.7 g 13) 1.71 m
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