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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
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