1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
joja [24]
3 years ago
13

How much heat energy, in kilojoules, is required to convert 53.0 g of ice at −18.0 ∘C to water at 25.0 ∘C ? Express your answer

to three significant figures and include the appropriate units.
Chemistry
1 answer:
ANTONII [103]3 years ago
8 0

Answer:

25.2 kJ of heat energy is required to convert 53.0 g of ice at −18.0 ∘C to water at 25.0 ∘C

Explanation:

Data: mass of ice = m = 53.0 g

         Temperature of ice = T1 = -18.0 ∘C

         Temperature of water = T2 = 25.0 ∘C

          Change in Temperature = ΔT : T2-T1                                          

           Specific heat of ice = c(i) = 2.09 J/g . ∘C

          Specific heat of water = c(w) = 4.18 J/g . ∘C

          Enthalpy of fusion of water (when convert from ice to water) = ΔH(f) : 334 J/g

          Enthalpy of vapourization of water (when convert from water to gas) = ΔH(v) :2250 J/g

          Total heat required = q = ?

Solution:        Heat required to melt the ice

                      T1 = -18 ∘C

                      T2 = 0 ∘C

                      Q1 = m x c(i) x ΔT

                      Q1 = 53.0 x 2.09 x (0-(-18))

                      Q1 = 53.0 x 2.09 x 18

                      Q1 = 1993.86 J is required by ice to reach to its

                      melting point.

                      <u>Heat required to convert the ice into water</u>

                      Q2 = ΔH(f) x m

                      Q2 = 334 x 53.0 = 17702 J is required by ice to  

                      convert into water.

                      <u> Heat required by water to reach at 25 ∘C</u>

                       T1 = 0 ∘C

                       T2 = 25 ∘C

                       Q3 = m x c(w) x ΔT

                       Q3 = 53.0 x 4.18 x (25-0)

                       Q3 = 5538.5 J is required by water to reach at  

                       25∘C .

                       <u>Total heat required by 53.0 g of ice at −18.0 ∘C  </u>

                        <u>to water at </u>

                        <u>25.0 ∘C</u>

                        q = Q1 + Q2 + Q3

                        q = 1993.86 J + 17702 J + 5538.5 J

                        q = 25234.36 J is the total heat required 53.0 g  

                        of ice at −18.0 ∘C to water at 25.0 ∘C.

                        <u>Conversion from Joule (J) to Kilojoule (kJ)</u>

                          1000 J =  1 kJ

                          q = 25234.36 J/1000

                          q = 25.23436 kJ

                           <u>Conversion of heat in kJ to three significant   </u>

                           <u>figures</u>

                           q = 25.2 kJ

You might be interested in
CaCO3 → CaO + CO2 Calculate the theoretical yield of Calcium Oxide if 24.8 grams of Calcium Carbonate decomposes. Calculate the
RideAnS [48]

Answer:

Theoretical yield: 13.9 g

Percent yield: 94 %

Explanation:

The reaction is:

CaCO₃ → CaO + CO₂

We see that the reaction is correctly balanced.

1 mol of calcium carbonate can decompose to 1 mol of calcium oxide and 1 mol of carbon dioxide.

We convert the mass to moles: 24.8 g . 1mol / 100.08g = 0.248 moles

As ratio is 1:1, 0.248 moles of salt can decompose to 1 mol of oxide.

We convert the moles to mass: 0.248 mol . 56.08g /1mol = 13.9 g

That's the theoretical yield.

To determine the percent yield we think:

(Determined yield / Theoretical yield) . 100 → (13.1 / 13.9) . 100 = 94 %

5 0
2 years ago
Alpha-tocopherol is another name for ...
Alenkinab [10]

Answer:

Alpha-tocopherol is an alternative name for vitamin E, which has many important functions in your body.

Hope this helps!

7 0
3 years ago
In 1782 a French chemist named ________ proposed a systematic nomenclature for naming chemical compounds.
vodomira [7]

Answer:

Louis-Bernard Guyton De Morveau

Explanation:

He is who proposed the first systematic nomenclature for naming chemical compounds.

5 0
3 years ago
Read 2 more answers
Why are fungi classified together?
mash [69]

Answer:

A, they get their food in the same way.

Explanation:

Some fungi can be toxic or poisonous.

Example: mushrooms. Mushrooms typically are found in forests and meadows/plains.

Some fungi are glowing, brown, and in many forms/shapes.

In conclusion, fungi all get nutrient from the dirt they grew in, forests can be moist which gives fungi excellent places to form, usually around trees, because they can absorb plenty of nutrients from the dirt.

4 0
2 years ago
Naturally occuring element X exists in three isotopic forms: X-28 (27.730 amu, 60.58% abundance), X-29 (28.841 amu, 18.35% abund
bazaltina [42]

The Average atomic weight of X is 28.7amu

Isotopes are atoms with the same number of protons but differing numbers of neutrons.

Different isotopes have various atomic masses.

The proportion of atoms with a particular atomic mass that can be found in a naturally occurring sample of an element is known as the relative abundance of an isotope.

An element's average atomic mass is computed as a weighted average by multiplying the relative abundances of its isotopes by their respective atomic masses, then adding the resulting products.

Using mass spectrometry, it is possible to determine the relative abundance of each isotope.

The atomic weight of the element will be a weighted average of the isotopes based on the relative abundance:

(27.730 x 0.6058) + (28.841 x 0.1835) + (31.321 x 0.2107) = 16.7988 + 5.2923+ 6.599 = 28.690 = 28.7 amu.

Average atomic weight of X is 28.7amu

Learn more about Average Atomic Weight here

brainly.com/question/6200158

#SPJ4

3 0
2 years ago
Other questions:
  • Which food is not a heterogeneous mixture?
    9·2 answers
  • Hi i need hel does any one know what P3N2 means ??? .-.
    9·1 answer
  • Which activities describe the use of technology in science? Check all that apply.
    15·1 answer
  • If a car has a force of 490 N forward and encounters a backwards force of
    5·1 answer
  • Read the speedometer and report the speed to the proper
    8·1 answer
  • How much solar radiation is reflected back by clouds?
    15·1 answer
  • What is an accurate description of a period in the periodic table
    9·2 answers
  • How is energy converted in a hydroelectric plant?
    9·1 answer
  • On the 14 point pH scale, soaps and cleaning solutions are typically -
    6·2 answers
  • How many moles of Hydrogen gas will be produced if you start with 2.5 moles of Magnesium and an excess of Hydrochloric Acid give
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!