Finding molar mass starts with units of grams per mole (g/mol). When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. The formula weight is simply the weight in atomic mass units of all the atoms in a given formula. This page was loaded in 0.004 seconds. Molecular Weight-Gases and Vapors. The molecular weight of a substance, also called molecular mass, is the mass of one molecule of that substance, relative to the unified atomic mass unit u equal to 1/12 the mass of one atom of carbon-12. ›› More information on molar mass and molecular weight. In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together. Assume that butane is an ideal gas and that one mole has a volume of 22.4 L at STP. V 1 /n 1 = V 2 /n 2 0.0896 L/n = 22.4 L/1 mole n = 0.0040 moles 12. Experimental molar mass (g/mole) of butane: 0.23 g/0.0040 moles = 58 g/mole 13. The molecular formula of butane is C 4 H 10. Making the world better, one answer at a time. Propane is a molecule consisting of 3 carbons and 8 hydrogens, and is written in the form of C3H8. Carbon has a molecular weight of 12, and hydrogen of 1. Therefore. 3 carbons x 12 = 36.
http://www.convertunits.com/molarmass/Propane http://www.engineeringtoolbox.com/molecular-weight-gas-vapor-d_1156.html http://www.convertunits.com/molarmass/Propane http://www.flinnsci.com/media/718035/cf10635.pdf http://www.answers.com/Q/What_is_the_molecular_weight_of_propane
molecular weight of propane