91Ó°ÊÓ

A Freon Th leak in the air conditioning system of a large building re- leases 12 \(\mathrm{kg}\) of \(\mathrm{CHF}_{2} \mathrm{Cl}\) per month. If the leak is allowed to continue, how many kilograms of Cl are emitted into the atmosphere each year?

A Freon Th leak in the air conditioning system of a large building re- leases 12 \(\mathrm{kg}\) of \(\mathrm{CHF}_{2} \mathrm{Cl}\) per month. If the leak is allowed to continue, how many kilograms of Cl are emitted into the atmosphere each year?

A metal (M) forms an oxide with the formula \(\mathrm{M}_{2} \mathrm{O}\) . If the oxide con- tains 16.99\(\% \mathrm{O}\) by mass, what is the identity of the metal?

Estradiol is a female sexual hormone that causes maturation and maintenance of the female reproductive system. Elemental analysis of estradiol gives the following mass percent composition: \(\mathrm{C} 79.37 \%, \mathrm{H}\) \(8.88 \%, \mathrm{O} 11.75 \% .\) The molar mass of estradiol is 272.37 \(\mathrm{g} / \mathrm{mol} .\) Find the molecular formula of estradiol.

Fructose is a common sugar found in fruit. Elemental analysis of fructose gives the following mass percent composition: \(\mathrm{C} 40.00 \%, \mathrm{H}\) \(6.72 \%, \mathrm{O} 53.28 \% .\) The molar mass of fructose is 180.16 \(\mathrm{g} / \mathrm{mol} .\) Find the molecular formula of fructose.

Combustion analysis of a 13.42 -g sample of equilin (which contains only carbon, hydrogen, and oxygen) produces 39.61 \(\mathrm{g} \mathrm{CO}_{2}\) and 9.01 \(\mathrm{g}\) \(\mathrm{H}_{2} \mathrm{O} .\) The molar mass of equilin is 268.34 \(\mathrm{g} / \mathrm{mol} .\) Find its molecular formula.

Estrone, which contains only carbon, hydrogen, and oxygen, is a female sexual hormone that occurs in the urine of pregnant women. Combustion analysis of a 1.893 -g sample of estrone produces 5.545 \(\mathrm{g}\) of \(\mathrm{CO}_{2}\) and 1.388 \(\mathrm{g} \mathrm{H}_{2} \mathrm{O}\) . The molar mass of estrone is 270.36 \(\mathrm{g} / \mathrm{mol}\) . Find its molecular formula.

Epsom salts is a hydrated ionic compound with the following formula: \(\mathrm{MgSO}_{4} \cdot x \mathrm{H}_{2} \mathrm{O} . \mathrm{A} 4.93-\mathrm{g}\) sample of Epsom salts was heated to drive of the water of hydration. The mass of the sample after complete dehydration was 2.41 \(\mathrm{g} .\) Find the number of waters of hydration \((x)\) in Epsom salts.

A hydrate of copper(II) chloride has the following formula: \(\mathrm{CuCl}_{2} \cdot x \mathrm{H}_{2} \mathrm{O} .\) The water in a \(3.41-\mathrm{g}\) sample of the hydrate is driven off by heating. The remaining sample has a mass of 2.69 \(\mathrm{g}\) . Find the number of waters of hydration \((x)\) in the hydrate.

Write the structural formulas of two different compounds that each has the molecular formula \(\mathrm{C}_{4} \mathrm{H}_{10} .\)