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Effectus [21]
4 years ago
6

A mixture formed of isopropyl alcohol C,H,OH (70%) and water (30%), if you know

Chemistry
1 answer:
scZoUnD [109]4 years ago
7 0

Answer:

(1) <em>C</em> C3H7OH = 9.200 M

(2) <em>C</em> C3H7OH = 11.647 m

Explanation:

mixture:

∴ 70% = (g C3H7OH/g mix)×100

∴ 30% = (gH2O/g mix)×100

∴ δ mix = 0.79 g/mL

assuming:

  • g mix = 100g = 0.100 Kg

⇒ V mix = (100g)×(mL/0.79g) = 126.582 mL mix = 0.1266 L mix

⇒ g C3H7OH = 70g

⇒ g H2O = 30g

∴ Mw C3H7OH = 60.1 g/mol

∴ Mw H2O = 18 g/mol

(1) Molar concentration (M):

  • M ≡ mol solute/L mix

⇒ <em>C</em> C3H7OH = ((70 g)(mol/60.1 g))/(0.1266L) = 9.200 M

(2) molal concentration (m):

  • m ≡ mol solute/Kg mix

⇒ <em>C </em>C3H7OH = ((70 g)(mol/60.1g))/(0.100 Kg) = 11.647 m

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Digiron [165]

Answer:

Water can be used as the thermometric liquid. It expands and contracts with temperature so it can be used. It's just not a very good choice because: It's thermal expansion is not very large compared to other liquids like mercury.

Explanation:

Hope this help

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3 years ago
Sandstone is a sedimentary rock which of the following characteristics would you look for in a piece of sand stone
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The mass of an object is 18g and its volume is 9 cm3 Sink Float​
11111nata11111 [884]
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6 0
4 years ago
Rachel has a sample containing 2 moles of carbon. How many atoms of carbon are in this sample?
Bumek [7]

Answer is: c. 1.204 × 10²⁴ atoms of carbon.

n(C) = 2 mol; amount of substance of carbon.

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N(C) = n(C) · Na.

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5 0
3 years ago
Read 2 more answers
What mass of benzene is cooled from 83.8 °C to 77.1 °C when 167 J of energy is transferred out of the system? (The specific heat
dexar [7]

Answer:

14.32g

Explanation:

Initial temperature = 83.8°C

Final temperature = 77.1°C

Temperature change, ΔT = 83.8°C - 77.1°C = 6.7

Heat, H = 167J

Specific heat, c = 1.740J/g °C

m = ?

All these parameters are related with the equation below;

H = mcΔT

m = H / cΔT

m = 167 /  (1.740 * 6.7)

m = 167 / 11.658 = 14.32g

3 0
3 years ago
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