[fiza43]

Ethane gas, C2H6, burns in air and produces carbon dioxide and water vapor .

a. write a balanced equation for this reaction.
2C2H6 + 7O2 -> 4CO2 + 6H2O

b. if 15.0 liters of ethane are burned at STP, how many liters of carbon dioxide are formed?
30 liters CO2

c. how many grams of water vapor are formed if 15.0 liters of ethane are burned?
HELP

[Yggdrasil]

c. how many grams of water vapor are formed if 15.0 liters of ethane are burned?
HELP

Here are some guiding questions to help you solve the question.
1) If 15L of ethane are burned, how many liters of water vapor are formed?
2) How many moles of water molecules are in this volume of water vapor (hint: use the ideal gas law, STP = 273K, 1atm)
3) How many grams of water are in a mole of water vapor?

[jonnyset]

here's how I did it.
Feel free to double check me:

15/22.4     X   3 (mole factor)     x    18 (molar mass of H₂O)   =

36.16 g

[Borek]

here's how I did it.
Feel free to double check me:

15/22.4     X   3 (mole factor)     x    18 (molar mass of H₂O)   =

36.16 g

OK.