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3 years ago

The transfer of energy by heat flow through a substance is accomplished by

Chemistry

2 answers:

alisha [4.7K]3 years ago

6 0

The transfer of energy by heat flow through a substance is accomplished by convection.

irga5000 [103]3 years ago

4 0

Answer:

The real answer is conduction.

Trust me on this one, it's correct. If you put the other answer, you will get it wrong. The answer is conduction, and I am 100% positive! :)

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The Mond process produces pure nickel metal via the thermal decomposition of nickel tetracarbonyl: Ni(CO)4 (l) → Ni (s) + 4CO (g

Yuki888 [10]

Answer: The volume of CO formed is 254.43 L.

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Given mass of $Ni(CO)_4$ = 444 g

Molar mass of $Ni(CO)_4$ = 170.73 g/mol

Putting values in above equation, we get:

$\text{Moles of }Ni(CO)_4=\frac{444g}{170.73g/mol}=2.60mol$

For the given chemical reaction:

$Ni(CO)_4(l)\rightarrow Ni(s)+4CO(g)$

By stoichiometry of the reaction:

1 mole of nickel tetracarbonyl produces 4 moles of carbon monoxide.

So, 2.60 moles of nickel tetracarbonyl will produce = $\frac{4}{1}\times 2.60=10.4mol$ of carbon monoxide.

Now, to calculate the volume of the gas, we use ideal gas equation, which is:

PV = nRT

where,

P = Pressure of the gas = 752 torr

V = Volume of the gas = ? L

n = Number of moles of gas = 10.4 mol

R = Gas constant = $62.364\text{ L Torr }mol^{-1}K^{-1}$

T = Temperature of the gas = $22^oC=(273+22)K=295K$

Putting values in above equation, we get:

$752torr\times V=10.4mol\times 62.364\text{ L Torr }mol^{-1}K^{-1}\times 295K\\\\V=254.43L$

Hence, the volume of CO formed is 254.43 L.

5 0

4 years ago

Use the observation in the first column

Lyrx [107]

Answer:

A. Substance E

A. Substance C

A. Substance A

Explanation:

Given that:

At 4 °C, Substance E has a vapor pressure of 86. torr and Substance F has a vapor pressure of 136. torr

Which has a higher boiling point?

A. Substance E

B. Substance F

C. Neither,EandF have the same boiling point

The vapor pressure varies inversely proportional to the boiling point.

$\mathbf{vapor \ pressure \ \ \alpha \ \ \dfrac{1}{boiling \ point}}$

Therefore, the lower the vapor pressure, the higher the boiling point.

At 4°C, Substance E with a lower vapor pressure of 86. torr will have a higher boiling point from the given information.

Recall that :

$\mathbf{vapor \ pressure \ \ \alpha \ \ \dfrac{1}{enthalpy \ of \ vaporization}}$

therefore, the lower the enthalpy of vaporization, the higher the vapor pressure at any given temperature.

Given that:

Substance C has an enthalpy of vaporization smaller than that of substance D. Then, substance C has a higher vapor pressure.

We've earlier said that:

The vapor pressure varies inversely proportional to the boiling point.

$\mathbf{vapor \ pressure \ \ \alpha \ \ \dfrac{1}{boiling \ point}}$

Therefore, the lower the vapor pressure, the higher the boiling point.

As such, Substance A will have a higher boiling point.

6 0

3 years ago

An unknown substance undergoes a chemical change that gives off heat. What can you tell me about this substance?

marin [14]

On a molecular level there is a lot of movement which in turn is the reason why heat is generated.

7 0

4 years ago

Read 2 more answers

The molecular weight of H2SO4 is: 49.078 g/mole 98.086 g/mole 194 296 armoe

a_sh-v [17]

Answer:

The answer to your question is: 98 gr / mole

Explanation:

Molecular weight and molecular mass are synonyms and they referred to sum of the the molecular masses of the elements that form part of a compound. Their units are grams/ mole

In your example we need to sum the molecular mass of the components of sulphuric acid.

Like this:

Hydrogen(H) = 1.008 x 2

Sulphur (S) = 32 x 1 = 32

Oxygen = 16 x 4 = 64

Total = 98 gr / mole

3 0

3 years ago

How can I get the 3 sig figs of this number 187515.4207

zimovet [89]

Answer:

1.88 x 10^5

Explanation:

You have to round because all of the numbers in 187515.4207 are significant

Round to: 188000

Put in scientific notation:

1.88 x 10^5

6 0

3 years ago

Read 2 more answers