Question 6.2: The work done when a gas is compressed in a cylinder like th...

The work done when a gas is compressed in a cylinder like that shown in Figure 6.5 is 462 J. During this process, there is a heat transfer of 128 J from the gas to the surroundings. Calculate the energy change for this process.

Strategy Compression is work done on the gas, so what is the sign for w? Heat is released by the gas to the surroundings. Is this an endothermic or exothermic process? What is the sign for q?

Capture

The "Step-by-Step Explanation" refers to a detailed and sequential breakdown of the solution or reasoning behind the answer. This comprehensive explanation walks through each step of the answer, offering you clarity and understanding.
Our explanations are based on the best information we have, but they may not always be right or fit every situation.

The blue check mark means that this solution has been answered and checked by an expert. This guarantees that the final answer is accurate.
Learn more on how we answer questions.

This Question has been Answered.

Already have an account?

Related Answered Questions

Question: 6.8

A quantity of 1.00 × 10² mL of 0.500 M HCl was mixed with 1.00 × 10² mL of 0.500 M NaOH in a constant-pressure calorimeter of negligible heat capacity. The initial temperature of the HCl and NaOH solutions was the same, 22.50°C, and the final temperature of the mixed solution was 25.86°C. Calculate ...

Verified Answer:

Assuming no heat is lost to the surroundings, [lat...

Question: 6.10

The thermite reaction involves aluminum and iron(III) oxide 2Al(s) + Fe2O3(s) → Al2O3(s) + 2Fe(l) This reaction is highly exothermic and the liquid iron formed is used This reaction is highly exothermic and the liquid iron formed is used to weld metals. Calculate the heat released in kilojoules per ...

Verified Answer:

Using the given

\Delta H^{°}_{f}

...

Question: 6.9

Calculate the standard enthalpy of formation of acetylene (C2H2) from its elements: 2C (graphite) + H2(g) → C2H2(g) The equations for each step and the corresponding enthalpy changes are ...

Verified Answer:

Looking at the synthesis of

C_{2}H_{2}[/lat...

Question: 6.6

A quantity of 1.435 g of naphthalene (C10H8), a pungent-smelling substance used in moth repellents, was burned in a constant-volume bomb calorimeter. Consequently, the temperature of the water rose from 20.28°C to 25.95°C. If the heat capacity of the bomb plus water was 10.17 kJ/°C, calculate the ...

Verified Answer:

The heat absorbed by the bomb and water is equal t...

Question: 6.7

A lead (Pb) pellet having a mass of 26.47 g at 89.98°C was placed in a constant-pressure calorimeter of negligible heat capacity containing 100.0 mL of water. The water temperature rose from 22.50°C to 23.17°C. What is the specific heat of the lead pellet? (Continued) Strategy We know the masses of ...

Verified Answer:

Treating the calorimeter as an isolated system (no...

Question: 6.5

A 466-g sample of water is heated from 8.50°C to 74.60°C. Calculate the amount of heat absorbed (in kilojoules) by the water. Strategy We know the quantity of water and the specific heat of water. With this information and the temperature rise, we can calculate the amount of heat absorbed (q). ...

Verified Answer:

Using Equation (6.12), we write q=mcΔt =(466 g)(4....

Question: 6.4

Calculate the change in internal energy when 2 moles of CO are converted to 2 moles of CO2 at 1 atm and 25°C: 2CO(g) + O2(g) → 2CO2(g) ΔH = −566.0 kJ/mol Strategy We are given the enthalpy change, ΔH, for the reaction and are asked to calculate the change in internal energy, ΔU. Therefore, we need ...

Verified Answer:

From the chemical equation we see that 3 moles of ...

Question: 6.3

Given the thermochemical equation 2SO2(g) + O2(g) → 2SO3(g) ΔH = −198.2 kJ/mol calculate the heat evolved when 87.9 g of SO2 (molar mass = 64.07 g/mol) is converted to SO3. Strategy The thermochemical equation shows that for every 2 moles of SO2 reacted, 198.2 kJ of heat are given off (note the ...

Verified Answer:

We need to first calculate the number of moles of ...

Question: 6.1

A certain gas expands in volume from 2.0 L to 6.0 L at constant temperature. Calculate the work done by the gas if it expands (a) against a vacuum and (b) against a constant pressure of 1.2 atm. Strategy Organize the data from the problem: Initial volume ...

Verified Answer:

(a) Because the external pressure is zero, no work...