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Naddika [18.5K]
3 years ago
8

Filling Air Bags Automobile air bags produce nitrogen gas from the reaction:

Chemistry
1 answer:
Alja [10]3 years ago
8 0

(a) The work done by the nitrogen against external pressure is 126.66 J.

(b) The change in the internal energy of the system is -2,466.66 J.

The given parameters:

  • <em>Mass of the compound, = 2.25 g</em>
  • <em>External pressure, P = 1.0 atm = 101325 Pa</em>
  • <em>Density of Nitrogen gas, ρ = 1.165 g/L</em>
  • <em>Temperature of the Nitrogen gas, T = 20⁰C</em>

<em />

The molar mass of the given compound is calculated as follows;

NaN₃ = 23+ (14 x 3) = 65 g/mol

65 g -------------- 42

2.25 g ------------- ?

= \frac{2.25 \times 42}{65} \\\\= 1.45 \ g

The volume of the nitrogen gas is calculated as follows;

\rho = \frac{m}{V} \\\\V = \frac{m}{\rho} \\\\V = \frac{1.45}{1.165} \\\\V = 1.25 \ L

V = 0.00125 \ m^3

The work done by the nitrogen against external pressure is calculated as follows;

W = PV\\\\W = 101325 \times 0.00125\\\\W = 126.66 \ J

The change in the internal energy of the system is calculated by applying first law of thermodynamics as follows;

\Delta E = Q - W\\\\\Delta E = (-2,340) - (126.66)\\\\\Delta E = -2,466.66 \ J

Learn more about first law of thermodynamics here: brainly.com/question/2965070

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Which of these describes a Mole in Chemistry?
olya-2409 [2.1K]

Answer: Thus the correct option is  D. All of the above describe a mole

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to molecular mass in grams.

1 mole of every substance contains avogadro's number 6.023\times 10^{23} of particles.

Mole is the S.I unit for measuring the amount of substance. It is often used to measure large number of particles.

Thus the correct option is  D. All of the above describe a mole

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3 years ago
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4 0
3 years ago
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Explanation:

8 0
2 years ago
What pressure, in atm, is exerted by 2.50 L of gas containing 1.35 mol at 320 K?
salantis [7]

Answer:

Option A = 14.19 atm

Explanation:

Given data:

Volume of gas = 2.50 L

Number of moles of gas = 1.35 mol

Temperature of gas = 320 K

Pressure of gas = ?

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

Now we will put the values in formula.

P × 2.50 L =  1.35 mol × 0.0821 atm.L/ mol.K×   320

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Thus, option A is correct.

6 0
3 years ago
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