Question

Complete
the
diagram
No of moles
No. of molecules
10 Co2
volume
at STP
Mass​

Answer 1

Explanation:

You now know that the molar mass of any substance is the mass in grams of one mole of representative particles of that substance. The representative particles can be atoms, molecules, or formula units of ionic compounds. This relationship is frequently used to make calculations in the laboratory. Suppose that you need 3.00 moles of calcium chloride (CaCl2) for a certain experiment. Since calcium chloride is a solid (Figure below), it would be convenient to measure out this amount by using a balance, but, to do so, you would need to know what mass of CaCl2 is equivalent to 3.00 moles. The molar mass of CaCl2 is 110.98 g/mol, so a conversion factor can be constructed based on the fact that 1 mol CaCl2 = 110.98 g CaCl2. Dimensional analysis will then allow you to calculate the mass of CaCl2 that you should use.

3.00 mol CaCl2×110.98 g CaCl21 mol CaCl2=333 g CaCl2

When you measure out 333 g of CaCl2, the resulting sample will contain 3.00 moles of CaCl2.