How many moles of sugar are required to react completely with 3.26 mol of oxygen?
Write the equation and balance it, then follow the instructions on the link I'm giving you. I'll help by giving you the balanced equation.
C12H22O11 + 12O2 ==>12CO2 + 11H2O
http://www.jiskha.com/science/chemistry/stoichiometry.html
This link will work any stoichiometry problem you have.
_____C2H5OH +_____ O2 „_ _____CO2 + _____H2O
Convert 3.09 g PCl5 to molecules
Find the percent by mass of oxygen in CaCO3
You should post separate questions for these, otherwise they sometimes get left behind.
C2H5OH + 3O2 ==> 2CO2 + 3H2O
%oxygen = (mass Oxygen/molar mass CaCO3)*100 = ?
mass oxygen, use atomic mass O or 3*16 = ?
moles PCl5 = grams/molar mass.
Then remember there are 6.022E23 molecules in one (1) mole of anything.
Calculate the mass of 3.53 x 10^12 atoms of gold is it 6.95x10^14?!
Convert 3.09 g PCl5 to molecules im getting two differnt answers when I'm doing this kind of problems I got .015mol than 14.82mol which is correct?
What is the mass of 4.419 mol of potassium nitride?
These are the last questions I will answer to this post. Post a new question if you have one.
moles Au = (3.53E12/6.022E23), then moles x atomic mass Au = grams Au. 6.95E14 is not correct.
For molecules PCl5 you would have done better to show what you did and I could find the error. It's more important to know how to work the problem.
moles = grams/molar mass = 3.09g/208.2 = 0.0148 (you have three places in 3.09 so DON'T round to 0.015) and moles x 6.022E23 = 8.94E21.
K3N problem.
grams = moles x molar mass
g = 4.419 x molar mass K3N = ??