Define: Conversion factors

an arithmetical multiplier for converting a set of units to another set of units. For example, a foot is 12 inches, so if you were to convert three feet to inches the equation would be 3ft/Xin and you would multiply three by twelve to get 36 inches.

A conversion factor is a number used to change one set of units to another, by multiplying or dividing. When a conversion is necessary, the appropriate conversion factor to an equal value must be used. For example, to convert inches to feet, the appropriate conversion value is 12 inches equal 1 foot.

2 moles

Explanation:

In one mole of sulfuric acid

There is 2 moles of hydrogen

4 moles of oxygen

and 1 mole of sulfur.