Molar Mass and Chemical Composition

This video tutorial explains how to calculate the molar mass of chemical compounds using their formulas. It covers basic examples like SO2 and C3H8O, and progresses to more complex compounds with parentheses and hydrates. The tutorial emphasizes understanding the number of atoms in a formula and using the periodic table to find atomic weights. By the end, viewers will be equipped to calculate molar mass for various chemical formulas, including those with parentheses and hydrates.

What is the molar mass of SO2?

• 16.0 g/mol

• 64.7 g/mol

• 128.0 g/mol

• 32.7 g/mol

How many oxygen atoms are present in one molecule of C3H8O?

• Three

• One

• Two

• Four

What is the molar mass of C3H8O?

• 88.2 g/mol

• 44.1 g/mol

• 60.11 g/mol

• 72.15 g/mol

In the compound Ca(NO3)2, how many nitrogen atoms are present?

• Four

• Three

• Two

• One

What is the molar mass of Ca(NO3)2?

• 100.1 g/mol

• 200.2 g/mol

• 164.10 g/mol

• 128.0 g/mol

How many hydrogen atoms are in (NH4)3P4?

• Sixteen

• Twelve

• Eight

• Four

What is the molar mass of (NH4)3P4?

• 149.12 g/mol

• 200.0 g/mol

• 180.0 g/mol

• 160.0 g/mol

In the hydrate MgSO4·7H2O, how many water molecules are present?

• Seven

• Six

• Eight

• Five

What is the total number of oxygen atoms in MgSO4·7H2O?

• Fourteen

• Seven

• Eleven

• Four

What is the molar mass of MgSO4·7H2O?

• 180.0 g/mol

• 200.0 g/mol

• 160.0 g/mol

• 246.50 g/mol