Answer:
Empirical Formula = C₃H₆O₁
Solution:
Data Given:
Mass of Ethyl Butyrate = 3.61 mg = 0.00361 g
Mass of CO₂ = 8.22 mg = 0.00822 g
Mass of H₂O = 3.35 mg = 0.00335 g
Step 1: Calculate %age of Elements as;
%C = (mass of CO₂ ÷ Mass of sample) × (12 ÷ 44) × 100
%C = (0.00822 ÷ 0.00361) × (12 ÷ 44) × 100
%C = (2.277) × (12 ÷ 44) × 100
%C = 2.277 × 0.2727 × 100
%C = 62.09 %
%H = (mass of H₂O ÷ Mass of sample) × (2.02 ÷ 18.02) × 100
%H = (0.00335 ÷ 0.00361) × (2.02 ÷ 18.02) × 100
%H = (0.9279) × (2.02 ÷ 18.02) × 100
%H = 0.9279 × 0.1120 × 100
%H = 10.39 %
%O = 100% - (%C + %H)
%O = 100% - (62.09% + 10.39%)
%O = 100% - 72.48%
%O = 27.52 %
Step 2: Calculate Moles of each Element;
Moles of C = %C ÷ At.Mass of C
Moles of C = 62.09 ÷ 12.01
Moles of C = 5.169 mol
Moles of H = %H ÷ At.Mass of H
Moles of H = 10.39 ÷ 1.01
Moles of H = 10.287 mol
Moles of O = %O ÷ At.Mass of O
Moles of O = 27.52 ÷ 16.0
Moles of O = 1.720 mol
Step 3: Find out mole ratio and simplify it;
C H O
5.169 10.287 1.720
5.169/1.720 10.287/1.720 1.720/1.720
3.00 5.98 1
3 ≈ 6 1
Result:
Empirical Formula = C₃H₆O₁
A)2.63x10^6 B)0.0000026
Answer:
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(2) The catalyst provides an alternate reaction pathway with a lower activation energy.
(3) The catalyst provides the same reaction pathway with a higher activation energy.
(4) The catalyst provides the same reaction pathway with a lower activation energy.
What is the molecular formula of the alcohol?
Answer:
Explanation:
For a compound as:
Let say your sample weighs 100 g, then you have
52 g of C
35 g of O
13 g of H
Now you need to calculate the moles in the sample:
moles of C = 52 / 12 = 4.3333
moles of O = 35 / 16 = 2.1875
moles of H = 13 / 1 = 13
Now you divide the moles by the least to have a proportion (2.1875):
moles of C = 4.3333 / 2.1875 = 2
moles of O = 2.1875 / 2.1875 = 1
moles of H = 13 / 2.1875 = 6
So the molecule proportion of atoms is C:H:O = 2:6:1
Now to find x you have to calculate the MM:
MM = 12 * 2x + 1 * 6x + 16 * x = 46x
For x = 1 => MM = 46(1) = 46
For x = 2 => MM = 46(2) = 92
Since the MM is between 30 and 80, x = 1
b. protons in the nucleus
c. valence electrons
d. innermost electrons
Answer: C. valence electrons
Explanation: Study Island