The Student Room Group

A Level Chemistry Help

I need help with how to answer Question 1b
The external tank of the space shuttle has a mass of 27 tonnes when empty and 745 tonnes when full. Assuming these are in the correct stoichiometric proportions (H2+1/2 O2=H2O) calculate the masses of hydrogen and oxygen in the external tank.
Space Shuttle Question.JPG
(edited 2 years ago)
Reply 1
What exam board is that 😳
Reply 2
Original post by dorotheapenguin
I need help with how to answer Question 1b
The external tank of the space shuttle has a mass of 27 tonnes when empty and 745 tonnes when full. Assuming these are in the correct stoichiometric proportions (H2+1/2 O2=H2O) calculate the masses of hydrogen and oxygen in the external tank.
Space Shuttle Question.JPG

Well... you know the molar ratio, so you can assume that Mr of the reacting mixture is just the combined Mr's of the two elements multiplied by their ratio. That way, you can use the mass and that combined Mr to work out the amount, in mol, of that mixture. Then you'll work out how many mol of each of those elements by multiplying the amount by each ratio. Then convert back to masses. Hopefully these two numbers will add up to your target mass.

Quick Reply

Latest