Mole Conversions Test Review 2024

Front

What is the molar mass of Al(OH)3?

Back

78.0 g/mol

Front

What percentage of the total atomic mass of carbon monoxide (CO) is composed of oxygen?

Back

57%

Front

How many molecules are in 2.5 mol of NaCl?

Back

1.51x10^24

Front

Which pair has the same empirical formula: NaCrO4 and Na2Cr2O7, or C2H4O2 and C6H12O6?

Back

C2H4O2 and C6H12O6

Front

How do you convert atoms to moles using dimensional analysis?

Back

Use Avogadro's number (6.022 x 10^23 atoms/mol) to convert atoms to moles.

Front

What is the formula to calculate the number of moles from mass?

Back

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

Front

Define empirical formula.

Back

An empirical formula shows the simplest whole-number ratio of elements in a compound.

Front

What is Avogadro's number?

Back

Avogadro's number is 6.022 x 10^23, representing the number of particles in one mole.

Front

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

Back

Percentage = (mass of element in 1 mol of compound / molar mass of compound) x 100%.

Front

What is the difference between molecular and empirical formulas?

Back

Molecular formulas show the actual number of atoms, while empirical formulas show the simplest ratio.