How many grams of C8H18 are needed to produce 100g CO2 in the following equation?

Question

anonymous · Answer

attachment

anonymous · Answer

I have my work included in this.

anonymous · Answer

@Callisto @Preetha

callisto · Answer

Is the equation of the reaction given?

anonymous · Answer

oh yes,
   2C8H18    +   25 O2      yields      16 CO2     +    18H2O

anonymous · Answer

Sorry, I forgot to include that part

callisto · Answer

Don't worry :)
$$2C_8H_{18} + 25O_2 \rightarrow 16CO_2 +18H_2O$$
no. of mole of CO2 produced required 
= 100/(12.0+16.0x2)
= a

No. of mole of C8H18 required
= No. of mole of CO2 x (2/16)
= a/8
= b

Mass of C8H18 required 
= no. of mole of C8H18 required x (12.0x8 + 1.0x18)
= b x (12.0x8 + 1.0x18)
= answer you need.

Is it clear?

anonymous · Answer

That seems generally what I did

anonymous · Answer

Thanks Callisto, that was the same result I got!

callisto · Answer

You're welcome. :)