Unit 6 -The Mole Review

Front

What is the molar mass of calcium carbonate (CaCO₃)?

Back

100 g

Front

How many grams are in 3 moles of sodium nitride (Na₃N)?

Back

207 grams

Front

What is the percent by mass of potassium in potassium chloride (KCl)?

Back

52.7%

Front

At STP, what volume does 10 g of helium gas occupy?

Back

56 L

Front

The molar mass of an element is the mass of one ____ of the element.

Back

mole

Front

Define 'mole' in chemistry.

Back

A mole is a unit that measures the amount of substance, defined as containing exactly 6.022 x 10²³ entities (atoms, molecules, etc.).

Front

What is the formula to calculate percent by mass?

Back

Percent by mass = (mass of solute / total mass of solution) x 100%.

Front

What is the ideal gas law equation?

Back

PV = nRT, where P = pressure, V = volume, n = number of moles, R = ideal gas constant, T = temperature.

Front

How do you convert moles to grams?

Back

Grams = moles x molar mass.

Front

What is STP in chemistry?

Back

STP stands for Standard Temperature and Pressure, defined as 0°C (273.15 K) and 1 atm pressure.