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Help with Molarity? What mass of water must be used to dissolve 500g C2H5OH to prepare a 3.00 m solution?

2.6 kg



1.65 kg



5.2 kg



3.87 kg

What is the molality of a solution that contains 80.0 g Al2(SO4)3 in 625 g H2O?

0.578 m



0.476 m



0.374 m



0.213

25 g of NaOH is dissolved in 120 g of water. What is the molality?

5.21 m



4.16 m



3.74 m



7.32 m

Verified Answer :

MissPhiladelphia

What mass of water must be used to dissolve 500g C2H5OH to prepare a 3.00 m solution?

500g C2H5OH ( 1 mol / 46.07 g ) / 3 mol/kg water = 3.62 kg water needed


What is the molality of a solution that contains 80.0 g Al2(SO4)3 in 625 g H2O?

Molality = 80.0 g Al2(SO4)3 (1 mol / 342.15 g) / .625 kg H2O = 0.374 m


25 g of NaOH is dissolved in 120 g of water. What is the molality?

Molality = 25 g NaOH ( 1 mol / 40 g ) / .120 kg = 5.21 m

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