Molarity (M)
What is the formula for molarity with units?
mol solute / L solution
What is the formula for molality with units?
mol solute / kg solvent
What is the formula for mass percent?
(mass solute / mass solution) * 100
What is the formula for mole fraction with units?
mol A / (mol A + mol B + mol C + ...)
What is the formula for parts per million?
(mass solute / mass solution) * 1,000,000
0.30 mol Ni / L
A solution contains 4.00 mol of cupric nitrate powder and 1.30 kg of vinegar. What is the molality of the solution?
3.08 mol cupric nitrate / kg vinegar
A 2.5 kg solution of salt water contains 70. grams of salt. What is the mass percent of salt?
2.8% salt by mass
A solution contains .0088 mol of chili powder, 0.0257 mol of sea salt, and 5.00 mol of water. What is the mole fraction of chili powder? Of sea salt?
0.017 mol/mol chili powder, 0.0050 mol/mol sea salt
A solution contains 0.90 kg of water and 0.30 mg of iron. What is the concentration of the solution expressed in parts per million?
0.33 ppm iron
A 500. mL solution contains 34.0 g of NaCl (sodium chloride). What is the molarity of the solution?
1.16 mol NaCl / L
A solution contains 249.8 grams of iron (ii) sulfate (molar mass: 151.9 g/mol) and 462.1 grams of water at room temperature. What is the molality of the solution?
3.559 mol iron (ii) sulphate / kg water
A mixture of salt and pepper contains 56.0 grams of salt and 74.0 grams of pepper. What is the mass percent of pepper?
56.9% pepper by mass
A solution contains 350. grams of lemon juice (molar mass: 190.12 g/mol) and 40.0 grams of sugar (molar mass: 342.3 g/mol). What is the mole fraction of sugar?
0.0597 mol/mol sugar
A solution contains 894 grams of water and 2.53e-5 mol of fluoride (molar mass: 19.0 g/mol). What is the concentration of the solution expressed in parts per million?
0.54 ppm fluoride
A solution of sugar water has a mass of 456 grams. The density of the solution is 0.984 g/mL. In the solution, there are 6.00 grams of sugar (molar mass: 342.3 g/mol). What is the molarity of the solution?
0.0378 mol sugar / L
A 3.2 L aqueous solution contains 82.0 grams of magnesium chloride (molar mass: 95.2 g/mol). The density of the solution is 0.989 g/mL. What is the molality of the solution?
0.279 mol magnesium chloride / kg water
A 300. mL mug contains hot water (density: 0.979 g/mL). Then, 0.0300 moles of sugar (molar mass: 342.3 g/mol) is added. What is the mass percent of sugar?
3.24% sugar by mass
A 1.30 L solution of salt water (density: 1.00 g/mol) contains 150. grams of salt (salt molar mass: 58.44 g/mol, water molar mass: 18.02 g/mol). What is the mole fraction of salt?
0.0387 mol/mol salt
How many milligrams of silicon are in a 1.497 ppm silicon sample of water with mass 1.423 kg?
2.130 mg silicon