Ask question

Ask question

All categories

3 years ago

14

How much thermal energy is needed to change the temperature of kg of water from 25 degrees Celsius to boiling (Hint : boiling in

Celsius = ??

1 answer:

uysha [10]3 years ago

3 0

∆H = mc∆T

c = specific heat capacity

c of water = 4200 J/kg °C

∆H = 1 * 4200 * (100°C - 25°C)

∆H = 315000J

∆H = 315 KJ

You might be interested in

An unknown compound has a percent composition of 52.10% potassium, 15.8% carbon, and 32.1% oxygen. The molar mass of the compoun

lianna [129]

To determine the empirical formula and the molecular formula of the compound, we assume a basis of the compound of 100 g. We do as follows:

Mass Moles
K 52.10 52.10/39.10 = 1.33 1.33/1.32 ≈ 1
C 15.8 15.8/12 = 1.32 1.32/1.32 ≈ 1
O 32.1 32.1 / 16 = 2.01 2.01/1.32 ≈ 1.5

The empirical formula would most likely be KCO.
The molecular formula would be K2C2O3.

4 0

4 years ago

Read 2 more answers

In what two ways can an object possess energy?

-BARSIC- [3]

Explanation:

An object can possess energy in tow ways by it's motion or position

5 0

3 years ago

PLEASE HELP ASAP I NEED IT

Lapatulllka [165]

the answer is true the first one

3 0

3 years ago

Calculate the total energy, in kilojoules, that is needed to turn a 46 g block

neonofarm [45]

Answer: The total energy, in kilojoules, that is needed to turn a 46 g block of ice at -25 degrees C into water vapor at 100 degrees C is 11.787 kJ.

Explanation:

Given: Mass = 46 g

Initial temperature = $-25^{o}C$

Final temperature = $100^{o}C$

Specific heat capacity of ice = 2.05 $J/g^{o}C$

Formula used to calculate the energy is as follows.

$q = m \times C \times (T_{2} - T_{1})$

where,

q = heat energy

m = mass

C = specific heat capacity

$T_{1}$ = initial temperature

$T_{2}$ = final temperature

Substitute the values into above formula as follows.

$q = m \times C \times (T_{2} - T_{1})\\= 46 g \times 2.05 J/g^{o}C \times (100 - (-25))^{o}C\\= 11787.5 J (1 J = 0.001 kJ)\\= 11.787 kJ$

Thus, we can conclude that the total energy, in kilojoules, that is needed to turn a 46 g block of ice at -25 degrees C into water vapor at 100 degrees C is 11.787 kJ.

7 0

3 years ago

What is responsible for moving the water to the ground?

Mandarinka [93]

Answer:

Water applied to the surface of a relatively dry soil infiltrates quickly due to the affinity of the soil particles for water. As time passes and the soil becomes wet, the force of gravity becomes the dominant force causing water to move.

Explanation:

6 0

3 years ago

Read 2 more answers