Lesson 4

Determine the number of moles of 0.1488 g of phosphoric acid, H3PO4.

1.518 x 10-3 mol

Calculate the mass of the solute 75.0 mL of 2.2 x 10-5 M H2SO4.

1.6 x 10-4 g

What is the total mass of hydrogen in C12H10O6?

10.08 amu

What mass of HCl is contained in 45.0 mL of an aqueous HCl solution that has a density of 1.19 g cm-3 and contains 37.21% HCl by mass?

19.9 g

The level of mercury in a stream was suspected to be above the minimum considered safe (1 part per billion by weight). An analysis indicated that the concentration was 0.68 parts per billion. Assume a density of 1.0 g/mL and calculate the molarity of mercury in the stream.

3.4 x 10-9 M

What is the mass of solute in 200.0 L of a 1.556 M solution of KBr?

3.703 x 104 g

Calculate the molar mass of boric acid, B(OH)3.

61.83 g/mol

Determine the percent of SO42- in Al2(SO4)3.

84.23%

Determine the molecular mass of the molecule below

98.079 g/mol

Which contains the greatest number of moles of oxygen atoms: 1 mol of ethanol (C2H5OH), 1 mol of formic acid (HCO2H), or 1 mol of water (H2O)?

Formic acid

Determine the molarity of 0.515 g of H2SO4 in 1.00 L of solution.

0.00525 M

Determine the molarity of 0.000889 g of glycine, C2H5NO2 in 1.05 mL of solution.

0.0113 M

Determine the molarity of 20.54 g of Al(NO3)3 in 1575 mL of solution.

0.0612 M

What is the molarity of HCl if 35.23 mL of a solution of HCl contain 0.3366 g of HCl?

0.2620 M

Determine the empirical formula for compound with the following percent composition: 43.6% phosphorus and 56.4% oxygen.

P2O5