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
umka21 [38]
2 years ago
14

unknown substance's mass: 75.0g, unknown substances molar mass = 150.0 g/mol, Hfus = 5.0x10^3 J/mol, Hvap = 1.00 x 10^4 J/mol, u

nknown substance's specific heat (liquid) = 2.2 J/g, unknown substance's specific heat (gas) = 4.8 J/g, unknown substances's specific heat (solid) = 5.0 J/g; Calculate the amount of heat (in J) for the unkown sample as it is heated at a constant rate from 10.0c to 25.0c as it passes through each of the following regions: region uv
Chemistry
2 answers:
Dimas [21]2 years ago
6 0

Answer:

kkajqjjqjqjnqnqnqjqjq

Leni [432]2 years ago
4 0
These are the answers hope this helps

You might be interested in
A cylinder and piston assembly (defined as the system) is warmed by an external flame. The contents of the cylinder expand, doin
melomori [17]

Answer:

ΔE = 73 J

Explanation:

By the first law of thermodynamics, the energy in the system must conserved:

ΔE = Q - W

Where ΔE is the internal energy, Q is the heat flow (positive if it's absorbed by the system, and negative if the system loses heat), and W is the work (positive if the system is expanding, and negative if the system is compressing).

So, Q = + 551 J, and W = + 478 J

ΔE = 551 - 478

ΔE = 73 J

3 0
3 years ago
The bonds in the reactants of Figure 7-3 contained 372 kJ of chemical energy and the bonds in the products contained 350 kJ of c
satela [25.4K]

Answer: 22 kJ amount of energy is released in the following reaction.

Explanation: There are two types of reaction on the basis of amount of heat absorbed or released.

1. Endothermic reactions: These are the type of reactions in which reactants absorb heat to form the products. The energy of the reactants is less than the energy of the products.

2. Exothermic reactions: These are the type of reactions in which heat is released from the chemical reactions. The energy of the products is less than the reactants.

Sign convention for \Delta H: This value is negative for exothermic reactions and positive for endothermic reactions.

For the given chemical reaction,

Energy of the products is less than the energy of the reactants, Hence, this reaction will be a type of exothermic reaction and energy will be released during this chemical change.

Amount of energy released = (350 - 372) kJ = -22kJ

Negative sign symbolizes the energy is being released. So, 22 kJ amount of energy is released in the following reaction.

6 0
3 years ago
What is a zero order reaction? Give two examples.
dezoksy [38]

Answer:

I guess 3 to be honest and that's what I think

4 0
3 years ago
If you were to react 4.3 miles of magnesium phosphide how many moles of potassium would you need?
bixtya [17]

Answer:

25.8

Explanation:

Let's write the reaction between magnesium-phosphide and potassium:

Mg3P2 + K = Mg + K3P

And now let's balance this equation:

Mg3P2+6K=3Mg+2K3P

We see that the ratio of magnesium-phosphide and potassium is 1:6, which means that for every mole of magnesium-phosphide there need to be 6 moles of potassium.

Since we have 4.3 moles of Mg3P2, there need to be 6 • 4.3 = 25.8 moles of potassium.

5 0
3 years ago
What is the name of the compound with the formula PbF2?
Ber [7]

Lead fluoride hope this helps

4 0
3 years ago
Other questions:
  • For the following reaction, 11.6 grams of sulfur are allowed to react with 23.5 grams of carbon monoxide . sulfur(s) + carbon mo
    15·1 answer
  • the grams of carbohydrate in one apple if the apple has no fat and no protein and provides 72 kcal of energy
    8·1 answer
  • What is the most striking part of this simulation?
    13·1 answer
  • What is the mass in pounds of 1.000 quart of mercury
    15·1 answer
  • In your own words, explain a crucial piece of evidence that Johannes Kepler could have used to support one of his laws of planet
    6·1 answer
  • Calculate the following using the correct significant digits: 12.354 + 17.5?​
    10·1 answer
  • How many minutes would be required to electroplate 25.0 grams of chromium by passing a constant current of 4.80 amperes through
    13·1 answer
  • Density is a measure of
    13·1 answer
  • Which of these choices best describes a pedigree?
    6·1 answer
  • Sobre ações relacionadas ao aquecimento global, assinale somente as alternativas corretas:
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!