The empirical formula of styrene is ch; the molar mass of styrene is 104.14 g/mol. how many h atoms are present in a 2.20 g sample of styrene?

In chemistry, there can be two types of written formula: empirical and molecular. Empirical formula is the simplified version of your molecular formula. The molecular formula is the actual identity of your compound in nature. For example, the molecular form of glucose is C₆H₁₂O₆. If you simplify the subscripts, the empirical formula becomes CH₂O.

To know the molecular formula of styrene (without searching in the internet), divide the given molar mass to the molar mass of the empirical formula. 

Ratio = 104.14 / (12.01+1.01) = 7.998 ≈ 8

Thus, the molecular formula is C₈H₈. In every 1 atom of styrene, there are 8 atoms of hydrogen. Let's use this ratio. Also, in 1 mole of any substance, there are 6.022×10²³ atoms, also known as Avogadro's number. But first, let's see how many moles of styrene is in 2.2 g:

2.2 g * (1/104.14) = 0.0211 mol styrene
(0.0211 mol styrene)(6.022×10²³ atoms/mole)(8 atoms H/1 atom styrene) = 1.0165×10²³ atoms of hydrogen

Adozen is 1221/12 = 1.751.75 x 12 = 21therefore, 1.75 is the answer.