The Man Behind the Mole
What is the mole ratio of hydrogen to water in 2H2+O2-->H2O ?
2 moles of hydrogen: 1 mole of water
How many moles are in 12 grams of carbon?
1 mole of carbon
How many atoms are in 4.4 moles of silver?
2.65 x 1024 atoms of Ag
How many grams are there in 8 moles of water?
144 grams of H2O
Percent Composition
The percent composition of nitrogen in lidocaine, C14H22N2O is _________
C=12 *14 =168
H=1*22=22
N=14*2=28
O=16*1=16
C14H22N2O =234 Part/whole => 28/234 =12%
Given N2 + 3 H2 ---> 2 NH3, what is the mole ratio of NH3 to H2?
2 moles of NH3: 3 moles of H2
How many moles are in 2.3 grams of phosphorus?
0.074265 moles of phosphorus
How many atoms are in 0.7 moles of Yb?
4.2154 x 1023 atoms of Yb
What is the weight, in grams, of 2.3 moles of Cu(OH)2?
224.365 grams of Cu(OH)2
How many oxygen atoms are there in the formula: 4MgSO4
a. 4 b. 8 c. 12 d. 16
Daily double if you can write how many of each element
O4 = 4 oxygen
The coefficient in front of the compound is 4 therefore 4*4 = 16
Given 8 H2 + S8 ---> 8 H2S, what is the mole ratio of H2S to S8?
8 moles of H2S: 1 moles of S8
How many moles are in 2.45 x 10^23 molecules of CH4?
0.41 moles of CH4
How many molecules are in 5.8 moles of MgO?
3.49 x 1024 molecules of MgO
How many grams are there in 0.87 moles of FeF3?
98.1795 grams of FeF3
20. Triethylenemelamine has an empirical formula of C3H4N2 and a molar mass of 204.23 g/mole.
What is the correct molecular formula?
C9H12N6
C6H8N4
CHN
C12H18N3
C=12*3= 36
H= 1*4=4
N=14*2=28
C3H4N2 =68
Molecular/empirical = Mole ratio
234/68 = 3; therefore 3*C3H4N2 =3*68= 234
Given 2H + O2 ---> 2H2O. If you had 20 moles of H2 on hand and plenty of O2, how many moles of H2O could you make?
20 moles of water
How many moles are in 68 grams of copper (II) hydroxide, Cu(OH)2?
0.6969 moles of Cu(OH)2
How many molecules of CoCl2 are in 18.24 moles?
1.1 x 1025 molecules of CoCl2
How much does 4.2 moles of Ca(NO3)2 weigh, in grams?
689.22 grams of Ca(NO3)2
What is the name of the name of the law that states, "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules"?
Avogadro's Law
Given N2 + 3 H2 ---> 2 NH3, if 10 moles of NH3 were produced, how many moles of N2 would be required?
5 moles of N2
How many moles are in 598.2 grams of bleach (NaClO)?
8.03 moles of NaClO
How many molecules of NH4OH are there in 230 grams of NH4OH?
3.96 x 1024 molecules of NH4OH
How many grams of silver are there in 2.3 x 1024 atoms of silver?
421 grams of silver