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2 years ago

Hey guys!

Chemistry

1 answer:

melamori03 [73]2 years ago

7 0

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You’re probably familiar with the sour taste of acidic lemon juice and the slippery feel of alkaline (basic) soap. In fact, thes

Nimfa-mama [501]

Answer:

9.606 grams of citric acid are present in 125 mL of a 0.400 M citric acid solution.

Explanation:

Molarity : It is defined as the number of moles of solute present in one liter of solution. Mathematically written as:

$Molarity=\frac{\text{Moles of solute}}{\text{volume of solution in L}}$

Moles of citric acid = n

Volume of the citric acid solution = 125 mL =125 × 0.001 L= 0.125 L

(1 mL = 0.001L)

Molarity of the citric acid solution = 0.400 M

$0.400 M=\frac{n}{0.12 5L}$

n = 0.400 M × 0.125 L = 0.05 moles

Mass of 0.05 moles of citric acid :

$0.05 mol\times 192.12 g/mol=9.606 g$

9.606 grams of citric acid are present in 125 mL of a 0.400 M citric acid solution.

5 0

3 years ago

Gasoline is a mixture of hydrocarbons, a major component of which is octane, CH3CH2CH2CH2CH2CH2CH2CH3. Octane has a vapor pressu

Nitella [24]

Answer:

$\Delta \:H_{vap}=40383.88\ J/mol$

Explanation:

The expression for Clausius-Clapeyron Equation is shown below as:

$\ln P = \dfrac{-\Delta{H_{vap}}}{RT} + c$

Where,

P is the vapor pressure

ΔHvap is the Enthalpy of Vaporization

R is the gas constant (8.314×10⁻³ kJ /mol K)

c is the constant.

For two situations and phases, the equation becomes:

$\ln \left( \dfrac{P_1}{P_2} \right) = \dfrac{\Delta H_{vap}}{R} \left( \dfrac{1}{T_2}- \dfrac{1}{T_1} \right)$

Given:

$P_1$ = 13.95 torr

$P_2$ = 144.78 torr

$T_1$ = 25°C

The conversion of T( °C) to T(K) is shown below:

T(K) = T( °C) + 273.15

So,

T = (25 + 273.15) K = 298.15 K

$T_1$ = 298.15 K

$T_2$ = 75°C = 348.15 K

So,

$\ln \:\left(\:\frac{13.95}{144.78}\right)\:=\:\frac{\Delta \:H_{vap}}{8.314}\:\left(\:\frac{1}{348.15}-\:\frac{1}{298.15}\:\right)$

$\Delta \:H_{vap}=\ln \left(\frac{13.95}{144.78}\right)\frac{8.314}{\left(\frac{1}{348.15}-\frac{1}{298.15}\right)}$

$\Delta \:H_{vap}=\frac{8.314}{\frac{1}{348.15}-\frac{1}{298.15}}\left(\ln \left(13.95\right)-\ln \left(144.78\right)\right)$

$\Delta \:H_{vap}=\left(-\frac{863000.86966\dots }{50}\right)\left(\ln \left(13.95\right)-\ln \left(144.78\right)\right)$

$\Delta \:H_{vap}=40383.88\ J/mol$

4 0

2 years ago

Decide which element probably formed a compound with hydrogen that has a chemical formula most and least similar to the chemical

ss7ja [257]

Tbh I really don’t know

4 0

2 years ago

Read 2 more answers

Athy online

Lubov Fominskaja [6]

Yes it was appropriate according to this article”Vinegar and lemon juice are great options if you're looking for a good home remedy for bee stings and wasp stings too. Both contain a type of acid that will help to neutralise the sting and provide a soothing sensation.”

7 0

2 years ago

What's the correct answer

svp [43]

The correct answer I believe is sunlight

6 0

2 years ago