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
steposvetlana [31]
3 years ago
15

A scientist measures the standard enthalpy change for the following reaction to be -327.2 kJ : P4O10(s) 6 H2O(l)4H3PO4(aq) Based

on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of P4O10(s) is kJ/mol.
Chemistry
1 answer:
OleMash [197]3 years ago
5 0

Answer:

ΔH°f P4O10(s) = - 3115.795 KJ/mol

Explanation:

  • P4O10(s) + 6H2O(l) ↔ 4H3PO4(aq)
  • ΔH°rxn = ∑νiΔH°fi

∴ ΔH°rxn = - 327.2 KJ

∴ ΔH°f H2O(l) = - 285.84 KJ/mol

∴ ΔH°F H3PO4(aq) = - 1289.5088 KJ/mol

⇒ ΔH°rxn = (4)(- 1289.5088) - (6)(- 285.84) - ΔH°f P4O10(s) = - 327.2 KJ

⇒ ΔH°f P4O10(s) = - 5158.035 + 1715.04 + 327.2

⇒ ΔH°f P4O10(s) = - 3115.795 KJ/mol

You might be interested in
Two reactants, each having a mass of 50.0 g, react fully in a beaker. What is the total mass of the products in the reaction?
krok68 [10]

Answer:

100g......sieiekeskslapaokdkz

6 0
2 years ago
Refer to the electron distribution to answer 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s¹. What would be the period or series number of
Salsk061 [2.6K]

Answer:

C.5

Explanation:

A number of electrons present in valence shell of penultimate Shell represents the group of elements.

For s block elements: no.of group=number of valence shell electron.

p block elements: no. of group= 2 + 10 + number of valence electrons.

d block elements: no. of group= number(n-1)d electrons + number of electrons in nth shell.

Here, the differential electron is in p orbital hence, it belongs to p block

No. of group= 2+ 10 + 3=15 i.e 15th group or VA group.

5 0
3 years ago
Read 2 more answers
Which of the following is the best definition of ethics?
Andrej [43]

Answer:

C

Explanation:

I believe the answer is C.

4 0
3 years ago
Question 6 *
ycow [4]

Answer:

33 g

Explanation:

Given data:

Number of moles = 5 mol

Mass of compound = 165 g

Molar mass or gram formula mass = ?

Solution:

Formula:

Number of moles = mass/ molar mass

Now we will put the values in formula.

5 mol = 165 g/ gram formula mass

Gram formula mass = 165 g / 5 mol

Gram formula mass = 33 g/mol

7 0
3 years ago
Which is a chemical property of copper?
olasank [31]
The answer should be B, it reacts in air to form a green layer.

Chemical properties means that how the substance that reacts with other substance to produce new substances. Usually it cannot be measured or observed just with the substance itself.

From all the options above, only B is a reaction. The green layer formed is a new substance produced by copper and air. It involves a chemical change.

Other options like boiling points or state of matter, these are physical properties. They do not require it to react to other substances and the can be measured and observed easily.
7 0
3 years ago
Other questions:
  • Your class goes on a field trip to observe drilling machinery. The geologists at the drill site show you displays of drilled roc
    10·1 answer
  • How many grams of silver chloride are produced from 5g of Silver Nitrate reacting with an excess of barium chloride?
    10·1 answer
  • On approximately what day in 28-days cycle is the egg released from the ovary
    14·1 answer
  • Explain what it means by a balanced chemical equation
    12·1 answer
  • What kind of mixture is the copper chloride and water ? Explain why please !!!!!!!!!!!!!!!!!! Will mark brainliest !!!!!!!!!!!!!
    10·1 answer
  • What happens when you mix two different items (gases or liquids) together when they have different densities?
    15·1 answer
  • When plants make gluclose, they are converting the sun's radiant energy into?
    10·2 answers
  • I need help (yes agian)
    6·2 answers
  • Helppppppppppp it’s due today pls help and thanks
    15·1 answer
  • Convert 100.6 Kelvin to degrees C. <br><br>°C = K - 273 <br>[?] °C ​
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!