Concentration and Molarity

How many moles of sodium nitrate are there in 0.610 L of a 0.7 M solution of sodium nitrate? Use the appropriate formula to solve for the missing variable.

• 0.43 mol

• 0.87 mol

• 1.15 mol

How many kilograms of water are needed to form a 0.01 m solution if 5.1 moles are used?

• 0.0002 kg

• 0.051 kg

• 510 kg

Tags

NGSS.HS-PS1-7

How many moles of BaI₂ are present in 0.250 kg of H₂O if the concentration is 0.3 m?

• 0.075 mol

• 0.83 mol

• 1.25 mol

What is the molality of a solution formed by dissolving 1.2 moles of a solute in 0.800 kg of solvent?

• 0.67 m

• 0.96 m

• 1.5 m

Calculate the molarity of a solution made of 308 grams of calcium nitrate, if it is dissolved in 7.32 liters of water.

ANSWER WITH THREE SIG FIGS AND UNITS

Answer explanation

Use molar mass to convert from grams of calcium nitrate to moles of calcium nitrate (molar mass = 164.1 g/mol)

Units should be M

ANSWER WITH THREE SIG FIGS AND UNITS

We want 3.20 moles of solute dissolved in enough water to make a solution with a concentration of 0.150 M. What will the volume of the solution need be?

How many moles of solid CuCl₂ are needed to make up 15.00 liters of a 0.300 M aqueous solution of copper (II) chloride?

I used 117.0 g of NaCl to make up a 0.500 M solution. What volume is that?

I used 100.0 g of NaOH to make up 0.750 L of solution. What is the molarity of the solution?

How many grams of CuSO₄ should you weigh out if you want to make up 2.00 L of 0.200 M solution?