AP Chemistry Unit 1 Review

Front

How many moles are in 16.94g of water?

Back

0.9401 mol H₂O

Front

The average atomic mass of rhenium, Re, is 186.21 amu. If 37.1% of rhenium has mass = 185, what is the other stable isotope?

Back

Rhenium-187

Front

What would be the mass of 1.5 mol H₂O?

Back

27 g

Front

Which of the following properties uniquely identifies every element?

Back

Number of protons

Front

What is the empirical formula if you have 36.84% nitrogen and 63.16% oxygen?

Back

N₂O₃

Front

Define molar mass.

Back

The mass of one mole of a substance, typically expressed in grams per mole (g/mol).

Front

What is the formula to calculate moles from mass?

Back

Moles = Mass (g) / Molar Mass (g/mol).

Front

What is the difference between atomic mass and molar mass?

Back

Atomic mass is the mass of a single atom, while molar mass is the mass of one mole of atoms.

Front

What is an empirical formula?

Back

The simplest whole-number ratio of elements in a compound.

Front

How do you calculate the percentage composition of an element in a compound?

Back

(Mass of element in 1 mole of compound / Molar mass of compound) x 100.