Find the molar mass of ethanol,
C
2
H
6
O
C
2
H
6
O
.

BlackTom题目解析

Question

Find the molar mass of ethanol, 
C
2
H
6
O
C
2
H
6
O
 .

BlackTom题目解析

BlackTom AI · Accepted Answer

To begin, I’ll lay out what the question is asking: determine the molar mass of ethanol, whose formula is C2H6O. We’ll break down the contributions from each element using their approximate atomic masses.
Option 1: 29.02 g/mol. This value is far too small for ethanol; it resembles the mass of a small molecule containing mainly carbon and hydrogen, but not enough for two carbons, six hydrogens, and one oxygen. This likely arises from omitting oxygen or miscounting atoms.
Option 2: 45.06 g/mol. This is close to the correct range but slightly low. If one uses rounded atomic masses (for example C = 12.0, H = 1.0, O = 16.0) and does 2×12.0 + 6×1.0 + 16.0, they would get 24.0 + 6.0 + 16.0 = 46.0 g/mol, not 45.06 g/mol. The discrepancy suggests an arithmetic or rounding inconsistency.
Option 3: 46.07 g/mol. This value matches the standard calculated molar mass when using typical atomic masses (C ≈ 12.01, H ≈ 1.008, O ≈ 16.00): 2×12.01 + 6×1.008 + 16.00 = 24.02 + 6.048 + 16.00 ≈ 46.068 g/mol, which rounds to 46.07 g/mol. This aligns with accepted molar mass data for ethanol.
Option 4: 110.0 g/mol. This figure is clearly too large for ethanol and would suggest a molecule with many more atoms or a miscalculation; it is inconsistent with C2H6O’s actual composition.
In summary, the incorrect options arise from undercounting atoms, rounding errors, or arithmetic mistakes, while the correct value requires summing each element’s contribution accurately. The most precise approach uses standard atomic masses and sums to approximately 46.07 g/mol, illustrating why the 46.07 g/mol choice is the appropriate result for ethanol.

Find the molar mass of ethanol, C 2 H 6 O C 2 H 6 O . BlackTom题目解析单项选择题

类似问题

Question textWhat is the molecular mass of your product in g/mol to the nearest whole number? [table] Chlorinated DBA-1 | Answer 1 Question 5 g/mol Chlorinated DBA-5 | Answer 2 Question 5 g/mol Chlorinated DBA-6 | Answer 3 Question 5 g/mol [/table]

What is the mass in kilograms of 10 moles of Ibuprofen (an anti-inflammatory drug) ? (MW Ibuprofen = 206.3)

Which sample will have the greatest mass?

What is the mass of 91.4 moles of NH3 molecules?

The molar mass for H is 1 and for He is 4. What is the ratio of the molar mass of He to that of H2?

Q13 V20.0438 mol of an organic compound has a mass of 1.84 g. The compound is likely to be an:

Which of the following has the lowest mass?

3.0 g of a gas occupies the same volume as 1.0 g of methane gas, CH4, at the same temperature and pressure. The gas could be: [ Molar Masses (g mol-1) C = 12.0 H = 1.00 O = 16.0 N =14.0 ]

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单