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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 one to two sentences, make and justify a claim
about the number of moles of ethanol the chemist will use.


Sagot :

The number of moles of ethanol the chemist will use in the experiment involving 30g of ethanol is 0.65moles.

How to calculate number of moles?

The number of moles of a substance can be calculated by dividing the mass of the substance by its molar mass. That is;

no. of moles = mass ÷ molar mass

According to this question, a chemist will use a sample of 30 g of ethanol (CH3CH2OH) in an experiment. The number of moles can be calculated as follows:

Molar mass of ethanol = 12(2) + 1(5) + 17 = 46g/mol

no of moles = 30g ÷ 46g/mol

no. of moles = 0.65moles

Therefore, the number of moles of ethanol the chemist will use in the experiment involving 30g of ethanol is 0.65moles.

Learn more about moles at: https://brainly.com/question/1458253

The number of moles of ethanol the chemist will use is 0.65 moles.

What is a mole?

A mole is the atomic weight of a molecule of chemical in grams

To calculate the number of moles of ethanol the chemist will use, we apply the formula below.

Formula:

  • n = R'/M.............. Equation 1

Where:

  • n = number of moles of ethanol
  • m = mass of ethanol
  • M = molar mass of ethanol

From the question,

Given:

  • R' = 30 g
  • M = [(12.01)+(1.01×3)+(12.01)+(1.01×2)+(16.0)+(1.01)] = 46.08 g/mol

Substitute these values into equation 1

  • n = 30/46.08
  • n = 0.65 moles.

Hence, The number of moles of ethanol the chemist will use is 0.65 moles.

Learn more about moles here: https://brainly.com/question/15356425