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A chemist prepares a solution by dissolving 3.166 g of NaNO3 in enough water to make 200 mL of solution. What molar concentration of sodium nitrate should appear on the label?

Answer in units of M.

1 Answer

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0.185 M is the molar concentration of sodium nitrate should appear on the label.

Step-by-step explanation:

Data given:

mass of NaNO3 = 3.166 grams

atomic mass of NaNO3 = 84.99 grams/mole

volume of the solution = 200 ml or 0.2 litres

molar concentration of sodium nitrate solution = ?

first number of moles of sodium nitrate is calculated as:

number of moles =
(mass)/(atomic mass of 1 mole)

number of moles =
(3.166)/(85)

number of moles = 0.037 moles

molarity =
(number of moles)/(\volume in litres)

putting the values in the equation:

molarity =
(0.037)/(0.2)

molarity = 0.185

Molar concentration of the sodium nitrate solution made with 3.166 grams of NaNO3 in 200 ml solution is 0.185 M

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