A student collected a total of 36.04 g of water from a reaction. What number of moles of water does this represent

To find the number of moles from a mass given, simply look to the formula n (moles) = m (mass, g) / MM (molar mass).

Mass was given, 36.04

Molar mass is the total atomic mass of all the atoms present. Water is H20, so that means 2 hydrogen and 1 oxygen. The atomic mass of hydrogen is 1 and atomic mass of oxygen is 16. Therefore MM = 1 + 1 + 16 = 18.

Plug that value in and the full equation is

n = 36.04/18

n = 2.002 moles

= 2 moles