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dem82 [27]
3 years ago
8

what is the concentration of each of these solutions expressed as a percent sucrose by mass? a) 17g sucrose mixing in 183g water

b) 30.0g sucrose mixing in 300.0g water
Chemistry
1 answer:
storchak [24]3 years ago
8 0
A) mass of solute = 17 g

mass of solvent = 183 g

% = mass of solute / total   x 100

% = 17 / ( 17 + 183 ) x 100

% = ( 17 / 200 ) x 100

% = 0.085 x 100

= 8.5 %
________________________________

b) mass of solute = 30.0 g

mass of solvent =300.0 g

% = mass of solute / total   x 100

% = 30.0 / ( 30.0 + 300.0 ) x 100

% = (30.0 / 330.0 ) x 100

% = 0.090 x 100

<span>= 9.0 %
</span>__________________________________________

hope this helps!


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What is the expected value for the heat of sublimation of acetic acid if its heat of fusion is 10.8 kJ/mol and its heat of vapor
Dennis_Churaev [7]

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35.1 kJ/mol is the expected value for the heat of sublimation of acetic acid.

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CH_3COOH(l)\rightarrow CH_3COOH(g)..[1]

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CH_3COOH(s)\rightarrow CH_3COOH(l)..[2]

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[1] + [2] = [3] (Hess's law)

H^o_{sub}=H^o_{vap}+H^o_{fus}

=24.3 kJ/mol+10.8 kJ/mol=35.1 kJ/mol

35.1 kJ/mol is the expected value for the heat of sublimation of acetic acid.

5 0
3 years ago
sarah measures out 151 grams of SO2. how many moles is this? Express your answer to three significant figures. ​
svp [43]

150 g SO₂ = 2.36 mol SO₂


M_r = 32.06 + 2×16.00 = 32.07 + 32.00 = 64.06


Moles of SO₂ = 151 g SO₂ × [1 mol SO₂/64.06 g SO₂] = 2.36 mol SO₂



4 0
3 years ago
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