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3 years ago

As you travel from a solid to a gas, energy is being absorbed or given off?

Chemistry

1 answer:

Wittaler [7]3 years ago

5 0

Sublimation is solid to a gas, during the process of sublimation energy is absorbed.

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Burka [1]

Answer:

$\large \boxed{\text{E) 721 K; B) 86.7 g}}$

Explanation:

Question 7.

We can use the Combined Gas Laws to solve this question.

a) Data

p₁ = 1.88 atm; p₂ = 2.50 atm

V₁ = 285 mL; V₂ = 435 mL

T₁ = 355 K; T₂ = ?

b) Calculation

$\begin{array}{rcl}\dfrac{p_{1}V_{1}}{T_{1}}& =&\dfrac{p_{2}V_{2}}{T_{2}}\\\\\dfrac{1.88\times285}{355} &= &\dfrac{2.50\times 435}{T_{2}}\\\\1.509& = &\dfrac{1088}{T_{2}}\\\\1.509T_{2} & = & 1088\\T_{2} & = & \dfrac{1088}{1.509}\\\\ & = & \textbf{721K}\\\end{array}\\\text{The gas must be heated to $\large \boxed{\textbf{721 K}}$}$

Question 8. I

We can use the Ideal Gas Law to solve this question.

pV = nRT

n = m/M

pV = (m/M)RT = mRT/M

a) Data:

p = 4.58 atm

V = 13.0 L

R = 0.082 06 L·atm·K⁻¹mol⁻¹

T = 385 K

M = 46.01 g/mol

(b) Calculation

$\begin{array}{rcl}pV & = & \dfrac{mRT}{M}\\\\4.58 \times 13.0 & = & \dfrac{m\times 0.08206\times 385}{46.01}\\\\59.54 & = & 0.6867m\\m & = & \dfrac{59.54}{0.6867 }\\\\ & = & \textbf{86.7 g}\\\end{array}\\\text{The mass of NO$_{2}$ is $\large \boxed{\textbf{86.7 g}}$}$

7 0

3 years ago

During the formation of a chemical bond, _________ must be transferred or shared between atoms to satisfy the octet rule. A) pro

ehidna [41]

Answer:

I think it's A or D im not sure which one..

3 0

3 years ago

Lecture 19 Equilibrium II Worksheet 1)The equilibrium constant, K c , is 9.8 x 10 5 for H 2 (g) + S (s) H 2 S (g). a.Find the re

Strike441 [17]

Answer:

a) Qc = 0.6338

b) Qc < Kc ⇒ the reaction proceeds to the right, towards the products.

Explanation:

H2(g) + S(s) ↔ H2S(g)

∴ Kc = 9.8 E5 = [H2S] / [H2]

a) reaction quotient, Q:

∴ Qc = [H2S] / [H2] = (0.483 M)/(0.762 M) = 0.6338

b) the process is not established equilibrium: Qc < Kc

⇒ The reaction evolves to the right, towards the products

6 0

3 years ago

Read 2 more answers

Heat energy is useful to us in all the following ways except:

Lelechka [254]

Answer:

Heat energy is transferred to cooler objects to reduce the temperature of those objects.

Explanation:

The fourth option is not correct.

A correct way of writing it would be : " Heat energy is transferred from cooler objects to reduce the temperature of those objects.". When an object loses heat energy, its temperature reduces. Conversely, when an object receives heat energy, its temperature increases.

3 0

3 years ago

Calculate the rms speed of co molecules at 320 k .

mezya [45]

<span>rms = (3RT/M)^1/2 Therefore, the rms of CO is: rms(CO) = [(3)(8.3145 J/mol*K)(320 K)/(0.028 kg/mol)]^1/2 rms = [2.65x10^5 m^2/s^2]^1/2 rms = 533.9181 m/s</span>

8 0

3 years ago