What masses are associated with ... #a.# a #1.5"mole"# quantity of potassium; #b.# a #2.5"mole"# quantity of carbon; #c.# a #1.5"mole"# quantity of potassium; and #d.# a #12.5"mole"# quantity of helium?

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Answer 1 · 2017-10-28T08:30:35

For each question, we multiply the molar quantity by the molar mass to get an answer in grams as required....

#a.# #1.50*molxx39.10*g*mol^-1=58.7*g*"potassium"#.

#b.# #2.50*molxx12.01*g*mol^-1=30.0*g*"carbon"#.

#c.# #0.250*molxx106.42*g*mol^-1=26.6*g*"palladium"#.

#d.# #12.5*molxx4.00*g*mol^-1=50.0*g*"helium"#.

In each case the product, gives an answer with dimensions of mass...i.e. #cancel(mol)xxg*cancel(mol^-1)=g#...as is absolutely required....

From where did I get the individual atomic masses? Did I know them from memory?

What masses are associated with ... #a.# a #1.5*"mole"# quantity of potassium; #b.# a #2.5*"mole"# quantity of carbon; #c.# a #1.5*"mole"# quantity of potassium; and #d.# a #12.5*"mole"# quantity of helium?