Molecular Formula Calculation Quiz

What is the primary focus of this video tutorial?

• Learning about atomic structure

• Studying periodic table trends

• Understanding chemical reactions

• Calculating molecular formulas

What is the first step in calculating the empirical formula from mass percentages?

• Find the molar mass

• Divide by the smallest mole value

• Assume a 100g sample

• Convert grams to moles

How do you convert grams to moles in the empirical formula calculation?

• Use the atomic number

• Use the periodic table

• Use the molecular weight

• Use the empirical formula

What do you do if the empirical formula subscripts are not whole numbers?

• Multiply by a common factor

• Ignore the decimals

• Add them together

• Round them to the nearest whole number

How is the molecular formula derived from the empirical formula?

• By dividing the molar mass of the molecular formula by the empirical formula

• By using the periodic table

• By adding atomic masses

• By multiplying the empirical formula by the atomic number

What is the molecular formula if the empirical formula is C10H7O2 and the molar mass is 318.14 g/mol?

• C10H7O2

• C20H14O4

• C5H3.5O

• C15H10.5O3

In the example with CH2O, what is the molar mass of the empirical formula?

• 15.15 g/mol

• 30.3 g/mol

• 180.18 g/mol

• 60.6 g/mol

What is the molecular formula for a compound with an empirical formula of CH2O and a molar mass of 180.18 g/mol?

• C3H6O3

• C2H4O2

• C12H24O12

• C6H12O6

For the compound with empirical formula NO2 and molar mass 92.2 g/mol, what is the molecular formula?

• N4O8

• N3O6

• NO2

• N2O4

What is the molar mass of the empirical formula NO2?

• 60.6 g/mol

• 30.3 g/mol

• 92.2 g/mol

• 46.01 g/mol