Chemistry, 25.12.2019 04:31 andreaisabela

Suppose that 25 g of each substance is initially at 27.0 °c. what is the final temperature of each substance upon absorbing 2.35 kj of heat?

a. gold

b. silver

Answers: 1

Show answers

Answers

Answer from: VinTAEge

The final temperature of the gold when it absorbs the heat is 755.68 ⁰C.

The final temperature of the silver when it absorbs the heat is 418.67 ⁰C.

The given parameters;

mass of each substance = 25 ginitial temperature of each substance = 27 ⁰Cspecific heat capacity of gold, = 0.129 J/ g⁰Cspecific heat capacity of silver, 0.24 J/ g⁰C

The final temperature of the gold when it absorbs 2,350 J;

Q = mcΔt

$2350 = 25 \times 0.129 \times (t- 27)\\\\2350 = 3.225t - 87.075\\\\3.225t = 2437.075 \\\\t = \frac{2437.075}{3.225} \\\\t = 755.68 \ ^0c$

The final temperature of the silver when it absorbs 2,350 J;

Q = mcΔt

$2350 = 25 \times 0.24 \times (t -27)\\\\2350 = 6t - 162\\\\6t = 2350 + 162\\\\6t = 2512\\\\t = \frac{2512}{6} \\\\t = \frac{2512}{6} \\\\t = 418.67 \ ^0C$

Learn more here:link

Answer from: leasiamoore

a. gold : 755.7°C.

b. silver: 418.7°C.

Explanation:

a. gold :

It is known that:

The amount of heat absorbed by gold = Q = m.c.ΔT.

where, m is the mass of Au (m = 25.0 g).

c is the specific heat capacity of Au = 0.129 J/g°C.

ΔT is the temperature difference = (final T - 27.0°C).

Q = 2.35 kJ = 2350.0 J.

∴ The amount of heat absorbed by Au = Q = m.c.ΔT = 2350.0 J.

∴ 2350.0 J = (25.0 g)(0.129 J/g°C)(final T - 27.0°C).

∴ 2350.0 J = 3.225 final T - 87.08.

∴ 3.225 final T = 2350.0 + 87.08 = 2473.

∴ final T = 2473/3.225 = 755.7°C.

b. silver:

It is known that:

The amount of heat absorbed by silver = Q = m.c.ΔT.

where, m is the mass of Ag (m = 25.0 g).

c is the specific heat capacity of Ag = 0.24 J/g°C.

ΔT is the temperature difference = (final T - 27.0°C).

Q = 2.35 kJ = 2350.0 J.

∴ The amount of heat absorbed by Ag = Q = m.c.ΔT = 2350.0 J.

∴ 2350.0 J = (25.0 g)(0.24 J/g°C)(final T - 27.0°C).

∴ 2350.0 J = 6.0 final T - 162.0.

∴ 6.0 final T = 2350.0 + 162.0 = 2512.

∴ final T = 2512/6.0 = 418.7°C.

Answer from: Quest

plasma is the state of matter where the substance is ionized and has no definite shape or volume. the fact of being ionized makes the substance a good electrical conductor.

Answer from: Quest

U whay do you need with?

Another question on Chemistry

Chemistry, 22.06.2019 00:10

Think about how you can use le chatelier’s principle to find possible solutions to the design problem. describe at least two ways to increase the yield (amount) of ammonia based on this principle.

Answers: 2

Answer

Chemistry, 22.06.2019 07:30

Label a-f based on the table using c for concentrated and d for dilute

Answers: 2

Answer

Chemistry, 22.06.2019 08:30

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains

Answers: 2

Answer

Chemistry, 22.06.2019 10:00

Why is the structure of molecule important to its function?