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
Finger [1]
3 years ago
12

1. Suppose during volleyball practice, you lost 2.0 lbs of water due to sweating. If all of this

Chemistry
1 answer:
Lynna [10]3 years ago
3 0

Answer:

E=2052.8 kJ

Explanation:

The energy absorbed by the water is the energy it requires to evaporate. So:

Heat of .vap= 40.65 kJ/mol

The moles of water:

n_w=m_w *\frac{1000g}{2.2lbs}*\frac{1}{M}

M is the water molecular weight

n_w=2 lbs *\frac{1000g}{2.2lbs}*\frac{1}{18g/mol}

n_w=50.5mol

The energy absorbed:

E=n_w*Heat of vap.=50.5mol *40.65 kJ/mol

E=2052.8 kJ

You might be interested in
A chemist measures the enthalpy change ?H during the following reaction: Fe (s) + 2HCl (g) ? FeCl2 (s) + H2 (g) =?H?157.kJ Use t
erik [133]

Correct Question:

A chemist measures the enthalpy change ΔH during the following reaction: Fe(s) + 2HCl(g)-->FeCl2(s) + H2 ΔH=-157.0 kJ. Use this information to complete the table below. Round each of your answers to the nearest kJ/mol

Answer:

-314 kJ

+628 kJ

+157 kJ

Explanation:

The enthalpy change of a reaction measures the amount of heat that is lost or gained by it. If ΔH >0 the heat is gained, and the reaction is called endothermic, if ΔH<0, the heat is lost, and the reaction is called exothermic.

If the reaction is inverted, the value of ΔH is inverted too (the opposite endothermic reaction is exothermic), and if the reaction is multiplied by a constant, ΔH will be multiplied by it too.

1) 2Fe(s) + 4HCl --> 2FeCl2(s) + 2H2(g)

This reaction is the product of the given reaction by 2, so

ΔH = 2*(-157) = -314 kJ

2) 4FeCl2(s) + 4H2(g) --> 4Fe(s) + 8HCl(g)

This reaction is the inverted reaction given multiplied by 4, so

ΔH = 4*(157) = +628 kJ

3) FeCl2(s) + H2(g) --> Fe(s) + 2HCl

This reaction is the inverted reaction given, so

ΔH = +157 kJ

4 0
3 years ago
If an atom gains an electron it is known as what ? And has a negative charge
bekas [8.4K]
If an atom gains an electron and gets a negative charge because of it, it is a negatively charge ion AKA an anion.
6 0
3 years ago
What is an elementary reaction?
tester [92]

Answer:

An elementary reaction is a chemical reaction in which one or more chemical species react directly to form products in a single reaction step and with a single transition state.

8 0
3 years ago
What two properties of gas make it unique to liquids and solids
elena-s [515]
1. Gas particles can move past each other
2. Gas particles flow easier
8 0
3 years ago
What would a chemist most likely study about a car? 1- The amount of rotations of the wheel that occur in 1 mile. 2- The reactio
NikAS [45]

Answer: B: the reaction of gasoline combustion in the engine

Explanation:

I just took the quiz

4 0
2 years ago
Other questions:
  • Imagine a drop of water in oil. If you add surfactant, explain how the surfactant molecules organize themselves around the water
    10·1 answer
  • Hurry I need help quickThe table shows the mass and boiling point of some substances. Boiling Point of Substances Mass (kg) Boil
    15·2 answers
  • How many grams are in 1.22 mol of Tungston
    5·1 answer
  • What is the formula unit for a compound made from Pb4+ and oxygen?
    9·2 answers
  • What must be part of a quantitative observation?
    9·2 answers
  • WILL MARK BRAINLIEST
    13·1 answer
  • A solid and a liquid are shaken together in a test tube to produce a milky mixture that eventually separates into a clear liquid
    8·2 answers
  • The Center for Disease Control publishes articles explaining the causes of seasonal West Nile virus. Research proves mosquitoes
    11·1 answer
  • Hi! I really really need help roght now please help me and if u put whatever in the chas as in just to get points i will ban you
    14·1 answer
  • In what way does ocean water move globally?
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!