Posted by Anonymous on Monday, October 8, 2012 at 12:27pm.
You would do well to restrict posts in the future to one problem per post.
1. How many moles of Al(CN)3 are in 199 g of the compound?
mol = g/molar mass
2. 96.0 mol of P4O10 contains how many moles of P?
mol = g/molar mass
3. If 4.71 moles of C5H12 reacts with excess O2, how many moles of CO2 will be produced in the following combustion reaction? C5H12+8O2 -> 6H20+5CO2
Here is a worked example. Just follow the steps.
http://www.jiskha.com/science/chemistry/stoichiometry.html
4. How many grams of O2(g) are needed to completely burn 51.0 g of C3H8(g)?
C3H8+5O2 -> 3CO2+4H2O
See problem 3.
5. How many grams of sodium iodide, NaI, must be used to produce 69.9 g of iodine, I2? 2NaI+Cl2 -> I2+2NaCl
See problem 3.
6. What is the average atomic mass of titanium on that planet?
Isotope: 46Ti
Abudance: 70.900%
Mass(amu): 45.95263
Isotope: 48Ti
Abudance: 10.000%
Mass(amu): 47.94795
Isotope: 50Ti
Abundance: 19.100%
Mass(amu): 49.94479
Take the three isotopes.
(abundance x amu) + (abundance x amu) + (abundance x amu) = average. The average is what you calculate.
On the last problem (#6) abundance goes in as a fraction.
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