Moles Practice

Front

The molar mass of an element is the mass of one ____ of the element, with numbers taken from the mass number on the periodic table.

Back

mole

Front

Which has more molecules? 1 mole CO₂, 1 mole of N₂O₄, 1 mole of H₂O, They are all the same

Back

They are all the same

Front

What is the mass of 3 moles of ammonia, NH₃?

Back

51g

Front

Which of these has the greatest volume at the same temperature & pressure? 1 mole CO₂ gas, 1 mole of N₂O₄ gas, 1 mole of C₃H₈ gas, They all have the same volume

Back

They all have the same volume

Front

What is the concentration of a solution if 0.25 mol is dissolved in 500 cm³ of solution?

Back

0.5 mol/dm³

Front

Define a mole in chemistry.

Back

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

Front

What is the relationship between moles and mass?

Back

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

Front

How many molecules are in 1 mole of any substance?

Back

6.022 x 10²³ molecules.

Front

What is the molar mass of water (H₂O)?

Back

18 g/mol.

Front

If you have 2 moles of NaCl, how many grams do you have?

Back

117 g (molar mass of NaCl is 58.5 g/mol).