What does the molar mass, M, give a convenient way for?
linking moles with mass for any chemical substance
What does the molar mass give?
it gives the mass in grams in each mole of the substance
What is the molar mass?
it is the mass per mole of a substance
What are the units of molar mass?
By what equation is the amount of substance (n), mass (m), and molar mass (M), linked by?
amount (n) = mass (m) / molar mass (M), OR, n = m/M
Example 1: Calculate the amount of substance, in moles, in 96.0g of carbon, C
n = m / M = 96.0 / 12.0 = 8.0mol
Example 2: Calculate the mass, in g, of 0.050 mol of NO2
rearrange n = m / M = n x M = 0.050 x 46.0 = 2.3g
Example 3: Calculate the molar mass when 2.65g contains 0.025mol of a substance
n = m / M —> rearrange: M = m / n = 2.65 / 0.025 = 106.0g mol^-1