Calculating Molar Mass

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Presentation transcript:

Calculating Molar Mass On the periodic table, the atomic mass given is the mass (in grams) of one mole of that atom. Sodium (Na) Molar Mass = 22.99 g Magnesium (Mg) = ____ g

What about molecules? NaCl has one of each atom = 22.990 + 35.453 = 58.443 g in one mole of NaCl H20 has 2 hydrogen and 1 oxygen = 2 (1.0079) + 15.999= 18.0148 g in one mole of H20

You need to be very careful when counting the number of atoms of each element in a molecule. Count the number of atoms for each element in the molecule: Ca(OH)2 Na2(CO3) CH3OH

Find the molar mass NH3 CO3 HCl Mg(OH)2 Fe3(PO4)2

Converting moles to mass Determine the molar mass of one mole of that molecule Use a conversion factor 1 mole = ____ g (molar mass)

Determine the number of moles: 25 g Li 251 g F2

Determine the mass: 2.63 moles of CuSO4 0.73 moles of Mg(OH)2

Volume Applies to gases ONLY at STP: 1 mole = 22.4 L This is referred to as molar volume STP- Standard Temperature (0°) & Pressure (1 atm)

How many grams are there in 28.6 L of carbon monoxide?