What is the concentration of a nacl solution prepared by dissolving 9.3 g of nacl in sufficient water to give 350 ml

[NaCl] = 0.45 M

Explanation:

First of all, you should be sure of what sort of concentration do you need. There are many ways to express concentration in a solution.

Let's calculate molarity. This is moles of solute in 1 L of solution.

Molar mass NaCl = 58.45 g/m

Mass / Molar mass = Mol → 9.3 g / 58.45 g/m = 0.159 moles

Volume of solution is 350 mL

Convert mL to L (/1000)

350 mL / 1000 = 0.350L

0.159 moles / 0.350L = 0.45 M

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

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