C) The solubility of magnesium nitrate in water is reported as 71.2 g salt in 10

Question

C) The solubility of magnesium nitrate in water is reported as 71.2 g salt in 100.0 g of water. For this saturated solution, determine: 10) Molarity (M) 11) Molality (m) 12) Mass % (m/m) 13) Mole fraction of water (X) 14) Mole of ions in 50.0 mL of this solution 15) Number atoms in 50.0 mL of this solution 16) If you added 150 g of this salt to 250 mL of water, how much of the salt would you expect to dissolve? Would this solution be saturated, unsaturated or supersaturated? Explains your answers. D) Molarity of an aqueous sample that is reported as being 255 ppm(part per million) chromium. E) You are asked to make 100 mL of 0.25 m solution of sodium hydroxide in ethanol Explain, including necessary calculations and specific detail, how you would go about making this quantity of this solution.

Explanation / Answer

10) first get the grams in moles: 71.2 g Mg(NO3)2/ 148.3148 g/mol= 0.4801 mols Mg(NO3)2

beacausethe desnisty of h20 is 1 g per 1 ml the h20 is .1 L

Molarity= .04801 mol/.100L H20 = .4801 M

11) the molarity is .04801 mol/ .1 kg = .4801

sorry i dont have time to do the rest

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