Question

If you are given 64.0 grams of CH4, how many grams of H2O are made?
look at the attached image

Answer 1

×=144g

Explanation:

first, we should see that wheather the reaction is balanced or not

CH4 +2O2=Co2+2H2o

n=given mass /molar mass

nCH4=64/16 CH4=12+4=16

nCH4=4moles

comparing the given data

1-------2 (one mole of methane gives 2 moles of water) (given data)

4------x (four moles of methane gives x moles of water) (eqn data)

by cross multiplying

x=8 (n=8)

then,

to calculate the mass of H20

= n=x/m

8=x/18 ( H20= 2+16=18 )

x=144g