I am taking a exam in two weeks.
I need help on these three questions:
I would also like it if someone explained to me in a really simple form.
1: 16g sample of an iron oxide contains 84g of iron and 32g of oxygen. Calculate the Emperial Formula?
I UNDERSTAND What I have to do
Divide 84 and 56( 1.5 mole) then 32 and 16( 2 moles) but what after that?
Yes I know that you multiply both by 3 and get Fe304 BUT How do you know to multiply by three to get Fe304, I need that explained to me
2: So calculate the Molar Enthalpy change for burning of Propanol (C3H17OH)
Yes i've got that it's 60
Now I looked up the answer and it's 18.8 x 60
Can someone please explain where you get 18.8 from? That's all i'm stuck on for this question.
3:
2KOH + H2SO4 > k2SO4 + 2H20
question:
25.0cm of KOH was used and it's concentration was 0.200mol
Calculate the amount of KOH used in moles
Calculate the amount of H2SO4 used in moles
Calculate the concentration pf the acid in solution in mol/dm3
Calculate the concentration of the KOH Solution in g/dm3
^ Need this explained to be also..