Question

USE SMALL WORDS Use this reaction to answer the question.

CH3COOH → CO2 + CH4

Use the table of molar masses to complete the activity.

Element Molar Mass (g/mol)
carbon 12.01
hydrogen 1.01
oxygen 16.00
A chemist will use a sample of 30 g of ethanol (CH3CH2OH) in an experiment. In 1–2 sentences, make and justify a claim about the number of moles of ethanol the chemist will use by calculating the molar mass of ethanol and using it to find moles.

(2 points)

Answer 1

To find the number of moles of ethanol (C2H5OH), we first need to calculate its molar mass. The molar mass of ethanol is:

- Carbon: 2 x 12.01 g/mol = 24.02 g/mol
- Hydrogen: 6 x 1.01 g/mol = 6.06 g/mol
- Oxygen: 1 x 16.00 g/mol = 16.00 g/mol

Adding these together:
24.02 + 6.06 + 16.00 = 46.08 g/mol

Now, to find the number of moles in 30 g of ethanol:
Moles = mass (g) / molar mass (g/mol) = 30 g / 46.08 g/mol ≈ 0.65 moles

**Claim:** The chemist will use about 0.65 moles of ethanol. This is based on the molar mass of ethanol being 46.08 g/mol, allowing us to calculate how many moles are in the 30 g sample.