Mole Test

Front

What is a mole?

Back

A mole is a unit of measurement in chemistry that represents 6.02 x 10^23 particles (atoms, molecules, ions, etc.).

Front

How do you convert grams to moles?

Back

To convert grams to moles, use the formula: \( \text{moles} = \frac{\text{grams}}{\text{molar mass}} \).

Front

What is the molar mass of NiS?

Back

The molar mass of NiS (Nickel Sulfide) is approximately 90 grams per mole.

Front

How many moles are in 57.2 grams of NiS?

Back

Using the formula: \( \text{moles} = \frac{57.2 \text{ grams}}{90 \text{ g/mol}} \approx 0.63 \text{ moles} \).

Front

What is Avogadro's number?

Back

Avogadro's number is 6.02 x 10^23, which is the number of particles in one mole of a substance.

Front

How do you find the number of molecules in a given mass of a substance?

Back

To find the number of molecules, first convert grams to moles, then multiply by Avogadro's number.

Front

What is the mass of 1 mole of CO2?

Back

The molar mass of CO2 (Carbon Dioxide) is approximately 44 grams per mole.

Front

How many moles are in 32.3 grams of CO2?

Back

Using the formula: \( \text{moles} = \frac{32.3 \text{ grams}}{44 \text{ g/mol}} \approx 0.73 \text{ moles} \).

Front

What is the mass of 4.98 x 10^24 atoms of Zn?

Back

To find the mass, first convert atoms to moles: \( \text{moles} = \frac{4.98 x 10^{24}}{6.02 x 10^{23}} \approx 8.27 \text{ moles} \). Then, multiply by the molar mass of Zn (65.38 g/mol) to get the mass.

Front

How do you convert moles of NaCl to grams?

Back

Use the formula: \( \text{grams} = \text{moles} \times \text{molar mass} \). The molar mass of NaCl is approximately 58.44 g/mol.