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3 years ago

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Chemistry

1 answer:

nordsb [41]3 years ago

3 0

D. Yep, D is the answer, alright.

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A sample of Freon-12 (CF2Cl2) occupies 2.842 x 101 L at 331 K and 2.525 x 102 kPa. Find its volume (in L) at standard temperatur

Angelina_Jolie [31]

We have to first find the number of moles of Freon-12 in the sample using the ideal gas law equation
PV = nRT
n = $\frac{PV}{RT}$
since the number of moles at both conditions given and at stp we can write the following formula
$\frac{P1V1}{RT1} = \frac{P2V2}{RT2}$
where parameters for the given conditions are on the left side and parameters for STP conditions are on the right side of the equation
where P1 - pressure - 252.5 kPa
V1 - volume - 28.42 x 10⁻³ m³
R - universal gas constant
T1 - 331 K

STP conditions
P2 - 101 325 Pa
T2 - 273 K

substituting these values in the equation

$\frac{252 500Pa*28.42*10 ^{-3}m^{3} }{R*331K} = \frac{101325 Pa*V}{R*273 K}$

V = 58.41 L
Volume at STP is 58.41 L

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2 years ago

What will be the volume of a balloon at 98 kPa if its volume is 9.65 L at 235 kPa?

OlgaM077 [116]

<span>Boyle's Law or Boyle-Mariotte's Law: Under constant temperature, the volume occupied by a given fixed mass of a gas is inversely proportional to its pressure.

Formula:
</span> $\frac{ P_{1} }{ P_{2} } = \frac{ V_{2} }{ V_{1} }$
Product of extremes equals product of means
$P_{1} * V_{1} = P_{2} * V_{2}$

Data:
$P_{1} = 235\:kPa$
$V_{1} = 9.65\:L$
$P_{2} = 98\:kPa$
$V_{2} = ?$

Solving:
$P_{1} * V_{1} = P_{2} * V_{2}$
$235*9.65 = 98*V_{2}$
$2267.75 = 98V_{2}$
$98V_{2} = 2267.75$
$V_{2} = \frac{2267.75}{235}$
$\boxed{\boxed{V_{2} \approx 23.14\:L}}\end{array}}\qquad\quad\checkmark$

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2 years ago

The primary forces of attraction between water molecules in h2o(l) are

finlep [7]

Hydrogen bonds 100% sure Have a great evening

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2 years ago

How many moles of KCl are in <br> 28g of KCl?

eduard

Answer:

0.38 moles KCl

Explanation:

(28 g KCl) / (74.55 g/mol KCl) = 0.38 moles KCl

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2 years ago

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How can a change to another population could affect births and deaths in the parrot population.

forsale [732]

Answer:

read it first

Explanation:

Population change is governed by the balance between birth rates and death rates. If the birth rate stays the same and the death rate decreases, then population numbers will grow. If the birth rate increases and the death rate stays the same, then population will also grow.

hope it helps

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1 year ago