Chem 1 Quiz 3 Stoichiometry
Chem 1 Quiz 3 Stoichiometry
Chem 1 Quiz 3 Stoichiometry
GROUP 1
SUMMER CLASS - CHEM 1 Inorganic
QUIZ # 3- STOICHIOMETRY
Problem Solving: Solve completely. Show complete solution below. Round off final
answer to two decimal places.
Solution:
O = 66.63g
N = 29.17g
H = 4.198g
4.164 mol of O = 4
2.082 mol of N = 2
4.164 mol of H = 4
N2H4O4 = NH2O2
2. A compound with the simplest formula C2H5O has a molecular mass of 90. What
is the molecular formula of the compound?
Ans: C4H10O2
(C2H5O)2 = C4H10O2
3. Myristic acid, obtained from coconut oil is 73.61% carbon, 12.38% hydrogen,
and 14.01% oxygen. What is its empirical formula?
Solution
6.128 mol of C = 6
12.281 mol of H = 12
0.875 mol of O = 1
= C6H12O
4. Vanillin, the active flavoring agent of the vanilla bean, contains 63.14% carbon,
5.31% hydrogen and 31.55% oxygen. What is the empirical formula of vanillin?
5.256 mol of C = 5
5.089 mol of H = 5
1.971 mol of O = 1
= C5H5O
Solution: