Calculating the number of molecules present in a sample
I can't seem the get the one problem correct. I need the calculate the number of molecules present in:
(a) 0.650 mol propane, C3H8, a gas used in laboratories
(b) a 500mg tablet of CaCO3, an antacid
Molecules - How many molecules are present in 475 mL of CO2 at STP?
a. 2.86 x 10 to the power of 23 molecules of CO2
b. 0.0212 molecules of CO2
c. 6.50 x 10 to the power of 21 molecules of CO2
d. 1.28 x 10 ...
Rate of destruction of methane - At an altitude of 35 kilometers, the average concentrations of O* and of CH4 are approximately 100 and 1E11 molecules cm-3 respectively, and the rate constant k for the above reaction is approximately ...
Writing chemical formulas. - What is the correct formula for a nickel(II) complex which contains 4 ammonia molecules and 2 water molecules?