The relative molecular mass (Mr) of a compound is 60. Which formulas are possible for this compound?
i) CH3CH2CH2NH2
ii) CH3CH2CH2OH
iii) CH3CHOHCH3
1) i and ii only
2) i and iii only
3) ii and iii only
4) i, ii, and iii
I got 3) for this question?
The empirical formula of a compound is C2H4O. Which molecular formulas are possible for this compound?
i) CH3COH
ii) CH3CH2CH2COOH
iii) CH3COOCH2CH3
1) i and ii only
2) i and iii only
3) ii and iii only
4) i, ii, and iii
I got 3) for this question as well? am I right?
In the balanced chemical reaction for the synthesis of tin(III) chloride, what is the coefficient for chlorine gas?
1) 1
2) 2
3) 3
4) 4
I got 3) for this question as well.
Consider the following reaction: 2C4H10(g) + 13O2(g) → 8CO2(g) + 10H2O(l) How many moles of carbon dioxide gas are produced by the complete combustion of 58 g of butane, C4H10(g)?
1) 4
2) 8
3) 12
4) 16
I got 1) for this.
Which interpretation of this balanced chemical equation is incorrect: 2Al(s) + 3Cl2(g) → 2AlCl3(s)
1) 2 atoms Al + 3 molecules Cl2 → 2 molecules AlCl3
2) 2 g Al + 3 g Cl2 → 2 g AlCl3
3) 2 mol Al + 3 mol Cl2 → 2 mol AlCl3
4) All of the above are correct interpretations
I got 3) for this.
Chemistry Homework Answers Check?
2020-05-06 11:46 am
回答 (2)
2020-05-06 12:41 pm
✔ 最佳答案
1. The relative molecular mass (Mr) …..Mᵣ for CH₃CH₂CH₂NH₂ (i, C₃H₉N) = 12×3 + 1×9 + 14 = 59
Mᵣ for CH₃CH₂CH₂OH (ii, C₃H₈O) = 12×3 + 1×8 + 16 = 60
Mᵣ for CH₃CHOHCH₃ (iii, C₃H₈O) = 12×3 + 1×8 + 16 = 60
The answer: 3) ii and iii only
(Your answer is correct.)
====
2. The empirical formula of a compound ……
i) The molecular formula is C₂H₄O, and thus the empirical formula is C₂H₄O.
ii) The molecular formula is C₄H₈O₂, and thus the empirical formula is C₂H₄O.
iii) The molecular formula is C₄H₈O₂, and thus the empirical formula is C₂H₄O.
The answer: 4) i, ii and iii
(Your answer is incorrect.)
====
3. In the balanced chemical reaction ……
The balanced equation is: 2Sn + 3Cl₂ → 2SnCl₃
The answer: 3) 3
(Your answer is correct.)
====
4. Consider the following reaction: 2C₄H₁₀(g) ……
2C₄H₁₀(g) + 13O₂(g) → 8CO₂(g) + 10H₂O(ℓ)
Mole ratio C₄H₁₀ : CO₂ = 2 : 8
Molar mass of C₄H₁₀ = 12×4 + 1×10 = 58 g/mol
Moles of C₄H₁₀ combusted = (58 g) / (58 g/mol) = 1 mol
Moles of CO₂ produced = (1 mol) × (8/2) = 4 mol
The answer: 1) 4
(Your answer is correct).
====
5. Which interpretation of this balanced chemical equation ……
1) and 3) are correct, but 2) is incorrect.
The answer: 2)
(Your answer is incorrect.)
2020-05-06 12:10 pm
Your first answer is correct.
Your second answer should be 4)
Your third answer is correct.
Your fourth answer is correct.
Your fifth answer should be 2)
Your second answer should be 4)
Your third answer is correct.
Your fourth answer is correct.
Your fifth answer should be 2)
收錄日期: 2021-04-24 08:04:36
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