Calculate the density of a liquid in g/mL to the correct number of significant digits, if a flask containing 9.55 mL of the liquid weighs 157.2 g with the liquid and 148.4 g when empty.

A backyard swimming pool holds 185 cubic yards (yd³) of water. What is the mass of the water in pounds?

A block of solid that weighs 58.16 g was placed in a container with a 100 mL capacity. It was then filled to capacity with liquid benzene and measured to have a combined weight of 96.15 g. Calculate the density of the solid if the density of benzene is 0.879 g/mL.

A student performs an experiment to determine the density of a sugar solution. She obtains the following results: 1.70 g/mL, 1.75 g/mL, 1.66 g/mL, and 1.68 g/mL. How should she report the average density of her measurements, including the uncertainty?

Calculate the temperature in °C of nitrogen gas (N2) with a density of 2.28 kg/m³ at a pressure of 2 atm. (Assume ideal gas behavior and use R = 0.0821 L·atm/mol·K for calculations.)

Calculate the number of atoms in a copper rod with a length of 9.85 cm and a radius of 1.05 cm. The density of copper is 8.96 g/cm³. (The volume of a cylinder is V = πr²l.) Express the number of atoms to three significant figures. Assume the molar mass of copper is 63.55 g/mol and Avogadro's number is 6.022 × 10²³ atoms/mol.

Greg has a blood volume of 5.9 qt. If the density of blood is 1.06 g/mL, what is the mass, in grams, of Greg's blood? (Note: 1 qt = 946.353 mL)