When an iron object rusts, its mass increases. When a match burns, its mass decreases. Do these observations violate the law of conservation of mass? Explain.
When an iron object rusts, its mass increases. When a match burns, its mass decreases. Do these observations violate the law of conservation of mass? Explain.
When an iron object rusts, its mass increases. When a match burns, its mass decreases. Do these observations violate the law of conservation of mass? Explain.
Expert Solution & Answer
Interpretation Introduction
Interpretation:
Whether the given observations violate the law of conservation of mass or not should be identified with explanation.
Concept introduction:
Law of conservation of mass: This law states that during a reaction process or in a chemical reaction, there is no change in the mass of reactants or mass of reactant is equal to the mass of product.
Answer to Problem 1E
No, given observations doesn’t violate the Law of Conservation of Mass.
Explanation of Solution
Given information:
When an iron object rusts, its mass increases.
When a match burns, its mass decreases.
According to law of conservation of mass, there is no change in the mass in a chemical reaction.
The given statement tells that when an iron object rusts, its mass increases.
When an iron object rusts, the change in state of iron occurs as iron reacts with oxygen and result in the formation of iron oxide. The addition of oxygen to iron increases the total mass but the mass of iron doesn’t change.
When a match burns, few mass of the compound which is present in the match decreases due to release of carbon dioxide gas during combustion. Also, some volatile gases also release. Thus, match shows a decrease in mass during burning.
Hence, both mentioned observation doesn’t violate the Law of Conservation of Mass.
Conclusion
No, given observations doesn’t violate the Law of Conservation of Mass.
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2H2S(g)+3O2(g)→2SO2(g)+2H2O(g)
A 1.2mol sample of H2S(g) is combined with excess O2(g), and the reaction goes to completion.
Question
Which of the following predicts the theoretical yield of SO2(g) from the reaction?
Responses
1.2 g
Answer A: 1.2 grams
A
41 g
Answer B: 41 grams
B
77 g
Answer C: 77 grams
C
154 g
Answer D: 154 grams
D
Part VII. Below are the 'HNMR, 13 C-NMR, COSY 2D- NMR, and HSQC 2D-NMR (similar with HETCOR but axes are reversed) spectra of an
organic compound with molecular formula C6H1003 - Assign chemical shift values to the H and c atoms of the
compound. Find the structure. Show complete solutions.
Predicted 1H NMR Spectrum
4.7 4.6 4.5 4.4 4.3 4.2 4.1 4.0 3.9 3.8 3.7 3.6 3.5 3.4 3.3 3.2 3.1 3.0 2.9 2.8 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.0 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1
f1 (ppm)
Predicted 13C NMR Spectrum
100
f1 (ppm)
30
220 210 200 190 180
170
160 150 140 130 120
110
90
80
70
-26
60
50
40
46
30
20
115
10
1.0 0.9 0.8
0
-10
Chapter 2 Solutions
General Chemistry: Principles And Modern Applications Plus Mastering Chemistry With Pearson Etext -- Access Card Package (11th Edition)
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