A2 m solution of nacl in water is at 20.0 oc. the density of the solution was measured to be 1.0768 g/ml at this temperature. calculate the molality of the salt solution. express your answer numerically to three significant figures.

Molality of the NaCl solution is 2.084 mol/kg.

Explanation:

Molarity of the solution is the moles of compound in 1 Liter solutions.

Molarity of the NaCl solution = 2 M

This means that in 1 liter solution there are 2 moles of NaCl.

Volume of the NaCl solution, V = 1 L = 1000 mL

Density of the solution = d = 1.0768 g/mL

Mass of solution= m

Mass of 2 moles of NaCl =58.5 g/mol × 2 mol = 117 g

Mass of solution = Mass of solvent + mass of solute

Mass of solvent = Mass of solution - mass of solute

= 1076.8 g - 117 g = 959.8 g

Mass of solvent = 959.8 g = 0.9598 kg

Molality of the NaCl solution:

i think it's letter a.

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.