If 26.35332 grams of Ca is reacted, how many moles of Calcium Oxide are produced?

1 Answer
May 31, 2017

Answer:

#0.6575180# #"mol CaO"#

Explanation:

I'll assume it reacts with excess oxygen, and forms only calcium oxide. The chemical equation for this reaction is

#2"Ca" (s) + "O"_2 (g) rarr 2"CaO" (s)#

First let's calculate the number of moles of #"Ca"# that reacts, using its molar mass:

#26.35332cancel("g Ca")((1"mol Ca")/(40.08cancel("g Ca"))) = color(red)(0.6575180 "mol Ca"#

Now, let's use the stoichiometrically equivalent values (the coefficients) in the chemical equation to calculate the number of moles of #"CaO"#:

#0.6575180 cancel("mol Ca")((2"mol CaO")/(2cancel("mol Ca"))) = color(blue)(0.6575180 "mol CaO"#

Therefore, #0.6575180 "mol CaO"# will form.

By the way, I've never seen #7# significant figures used in a problem before, I like it:)