Find the mass of na2co3 needed to give 22.4dm³ of ca2 stp in this reaction
na2co3+> 2nacl+co2+h2o
(na=23, o=16, c=12,molar volume or a gas at stp= 22.4dm³

the proximity of water was an advantage to western europe and its culture was able to flourish as a result. trade and travel by sea were easier and safer in historical times.

1. there are no mountains to protect it from the sea

2. and its has wet cool summers and wet, mild winters.

the answer would be the third option, "no, ariel should have added 9^2 and 12^2 and compared that to 15^2."

this is found through the pythagorean theorem, which is a^2 + b^2 = c^2.

this is the correct way of solving the problem:

9^2 + 12^2 = 15^2

81 + 144 = 225

225 = 225