Question

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Question?

A solution made from ethanol and water is 1.75 molar (m) in ethanol. How many grams of ethanol are contained per 250 grams of water?​

Answer 1

Hola!!

●Calculation of number of moles of ethanol in 250g water:-

$250 \times \frac{1.75}{1000} = 0.43 \: mole$

Molecular weight of ethanol = 46.07 gm/mol

●Convert moles of ethanol (0.43) into grams:-

$0.43 \times 46.07 = 19.81 \: grams$

Hope this helps you ___!!

Answer 2

So, there are 0.43 mole of ethanol in 250g of water.

But, how do we calculate the mass?

To do this, we need to set up another stoichiometry ratio using the molar mass of ethanol.

To calculate the molar mass of ethanol, we sum the molecular weight of each of the atoms in it. Ethanol has the molecular formula C2H5OH, so there are two carbon atoms, six hydrogen atoms and one oxygen atom. We can calculate the molar mass of ethanol as follows:

Carbon: 2 * 12.01g/mol

Hydrogen: 6 * 1.007g/mol

Oxygen: 15.999g/mol

So, the total molar mass for ethanol is 46.07g/mol

Now, we can convert the moles we calculated for ethanol in 250g of water to grams.

0.43 moles ethanol (46.07g / 1 mol) = 20.15g ethanol