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Empirical Formula

Q. What is the empirical formula for a compound that is 41.8% N, 24.7% C, 31.4% O, and 2.1% H by mass? If the molar mass of the compound is 100.06 g mol-1, what is the molecular formula?

Solved • Sep 16, 2019

Stoichiometry

Q. A mole of N2 has a mass of 28.14g, and a mole of H2 has a mass of 2.02g. How many grams of ammonia are formed when 14.07 grams of nitrogen react completely? A mole of ammonia, NH3, has a mass of 17.10g.

Solved • Sep 16, 2019

Partial Pressure

Q. A mixture of oxygen and helium is 92.3% by mass oxygen. It is collected at atmospheric pressure (745 torr). What is the partial pressure oxygen in this mixture? Report your answer in torr to the nearest whole number.

Solved • Sep 16, 2019

Equilibrium Expressions

Q. Write an equation below that shows how to calculate kp from Kc for this reaction at an absolute temperature T. You can assume T is comfortably above room temperature

Solved • Sep 16, 2019

Mole Concept

Q. 16. Determine the formula mass (in amu) for the following compounds: d) MgSO4

Solved • Sep 13, 2019

Solution Stoichiometry

Q. 15. An aliquot of a 8.50 M stock aqueous solution of sodium chloride is used to create 800. mL of a 0.100 M dilute solution. What is the mass (in g) of sodium chloride present in the dilute solution?

Solved • Sep 13, 2019

Mole Concept

Q. 16. Determine the formula mass (in amu) for the following compounds: c) C10H10FE

Solved • Sep 13, 2019