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3 years ago

1 point

Chemistry

2 answers:

I am Lyosha [343]3 years ago

8 0

$65.47 \: g \times \frac{12 \: donuts}{25.64 \: g} = 30.64118565$

$i \: have \: 31 \: donuts$

yawa3891 [41]3 years ago

3 0

Answer:

30. 6 so 31 donuts

Explanation:

12d→ 25.64g

xd → 65.47g

SO cross multiply or 65.47g ÷ 25.64g. Which gives 2. 55g then divide by 12 to get 30.6 for X. If you want to check the answer substitute X with 31 and see if you get the 6547g

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Specific heat and thermal Energy question. Will give brailiest. 30 points please answer!! ASAP

USPshnik [31]

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3 years ago

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The mole fraction of a non-electrolyte (MM 40.0 g/mol) in a saturated aqueous solution is 0.310. What is the molality of the sol

jeka57 [31]

<u>Answer:</u> The molality of non-electrolyte is 24.69 m

<u>Explanation:</u>

We are given:

Mole fraction of saturated aqueous solution = 0.310

This means that 0.310 moles of non-electrolyte is present.

Moles of water (solvent) = 1 - 0.310 = 0.690 moles

To calculate the mass from given number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Moles of water = 0.690 moles

Molar mass of water = 18 g/mol

Putting values in above equation, we get:

$0.690mol=\frac{\text{Mass of water}}{18g/mol}\\\\\text{Mass of water}=(0.690mol\times 18g/mol)=12.42g$

To calculate the molality of solution, we use the equation:

$\text{Molality}=\frac{n_{solute}\times 1000}{W_{solvent}\text{ (in grams)}}$

Where,

$n_{solute}$ = Moles of solute (non-electrolyte) = 0.310 moles

$W_{solvent}$ = Mass of solvent (water) = 12.42 g

Putting values in above equation, we get:

$\text{Molality of non-electrolyte}=\frac{0.310\times 1000}{12.42}\\\\\text{Molality of non-electrolyte}=24.96m$

Hence, the molality of non-electrolyte is 24.69 m

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Answer:

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