Calculate the molality of a solution obtained by dissolving `15.87 g` ehtyl alcohol `(C_(2) H_(5) OH)` in `168 g` of `H_(2) O`.

Calculate the molality of a solution by dissolving 0.850g of ammonia ( NH_3 ) in 100g of water.

Calculate the normality of solution containing 3.15 g of hydrated oxalic acid (H_2C_2O_4. 2H_2O) in 250 ml of solution ( Mol. Mass = 126).

What is would be the molality of a solution obtained by mixing equal volumes of 30% by weight H_(2) SO_(4) (d = 1.218 g mL^(-1)) and 70% by weight H_(2) SO_(4) (d = 1.610 g mL^(-1)) ? If the resulting solution has density 1.425 g mL^(-1) , calculate its molality.

What should be the freezing point of aqueous solution containing 17g of C_(2)H_(5)OH in 1000g of water ( K_(f) for water = 1.86 deg kg mol^(-1)) ?

Calculate the moles of NaOH required to neutralize the solution produced by dissolving 1.1 g P_(4)O_(6) in water. Use the following reactions: P_(4)O_(6) + 6H_(2)O to 4H_(3)PO_(3), 2NaOH + H_(3)PO_(3) to Na_(2)HPO_(3) + 2H_(2)O (At. Mass/g mol^(-1) P=31, O=16).

Calculate the number of atoms of each type that are present in 3.42 g of sucrose (C_(12) H_(22) O_(11)) .

Calculate the mass fraction and mole fraction of ethyl alcohol and H_(2) O in a solution containing 9.2 g of alcohol in 18.0 g of H_(2) O .

Calculate the mole fraction of Ethanol (C_(2)H_(5)OH) in the solution containing 20 g of Ethanol and 100 g of water.

Calculate the mole fraction of ethylene glycol (C_(2)H_(6)O_(2)) in a solution containing 20% of C_(2)H_(6)O_(2) by mass.

Calculate molality of 1 litre solution of 93% H_(2) SO_(4) by volume. The density of solution is 1.84 g mL^(-1) .