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
Fynjy0 [20]
3 years ago
11

Calculate the number of kilojoules to warm 125 g of iron from 23.5 degrees C to 78 degrees C

Chemistry
1 answer:
mina [271]3 years ago
5 0
The heat capacity of iron is 0.45J/g°C.
We calculate the heat using the equation:
ΔH = m cp ΔT
where 
<span>m is the mass
ΔH is enthalphy or the heat required
cp is the heat capacity
</span><span>ΔT is the change in temperature
</span>So, 
<span>ΔH = m cp ΔT = (125g) (0.45 J/g</span>°C) (75°C - 23.5<span>°C)
</span><span>ΔH = 2896.875 J
</span>
Dividing by 1000 to convert to kJ,
<span>ΔH = 2.897 kJ</span>
You might be interested in
Which of the following statements about matter is false?
4vir4ik [10]
The statement that is incorrect I believe would be A. The amount of matter increases slightly as water changes state.
8 0
3 years ago
Read 2 more answers
Atomic number of f^-1
victus00 [196]
The atomic number is 9 Ions have the same atomic number since atomic number signifies number of protons not electrons
7 0
3 years ago
What is the coefficient of mno2 when you balance the equation for this redox reaction? kcn(aq) + kmno4(aq) + h2o(l) → kcno(aq) +
Tasya [4]
Kcn(aq)+kmno4(aq)+h2o(l)----->2mno2(s)+koh(aq)

7 0
3 years ago
Read 2 more answers
en un recipiente se tiene 800 g de una solución al 35% en masa de ácido sulfuroso, de la cual se evapora 80ml de agua. ¿cuál es
Alinara [238K]

The mass percent of sulfurous acid in the new solution : 38.9%

<h3>Further explanation</h3>

<em>In a container you have 800 g of a 35% by mass solution of sulfurous acid, from which 80 ml of water evaporates. What is the mass percent of sulfurous acid in the new solution? data: density of water is 1g / ml.</em>

<em />

solution 1

composition :

  • 35% acid :

\tt 0.35\times 800~g=280~g

  • water :

\tt 800-280=520~g

solution 2(new solution)

composition :

  • water

\tt 520-(80~ml\times 1~g/ml)=440~g

  • Total mass of new solution after water evaporated

\tt 280(acid)+440(water)=720~g

  • %mass of acid in a new solution

\tt \dfrac{280}{720}\times 100\%=38.9\%

5 0
3 years ago
Sugar cannot be separated from sugar solution by filtering explain why?​
alexdok [17]

Answer:

The sugar particles are so small that they have dissolved in the water, and can easily pass through the filter.

5 0
2 years ago
Read 2 more answers
Other questions:
  • Which answer lists the fundamental forces in order from strongest to weakest
    12·2 answers
  • A sample of solid sodium hydroxide, weighing 13.20 grams is dissolved in deionized water to make a solution. What volume in mL o
    8·1 answer
  • To squeeze a gas into a smaller space you
    5·1 answer
  • Suggest a reason why the equilibrium between succinic acid and acetic anhydride lies on the side favoring formation of acetic ac
    14·1 answer
  • Which planets distance from the sun is 778,600,000
    12·1 answer
  • A student is told that both energy and mass must be conserved in every chemical reaction. She measures the mass of Hydrochloric
    8·2 answers
  • What are the three states of matter?
    6·1 answer
  • Which one is not a long-term environmental change?
    12·2 answers
  • How many grams of Al2O3are present in 7.1 x 10^22 molecules of Al2O3?
    15·1 answer
  • If a glass of water is left in open air for two days, what changes would it undergo in terms of
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!