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
Marina86 [1]
3 years ago
15

Please answer quick. In an experiment, a student collects 107 mL of H2 over water at a pressure of 104.8 kPa and a temperature o

f 30°C. How many grams of H2 are present?
A.
0.024 g
B.
4.00 g
C.
0.04 g
D.
0 049 g
And explain
Chemistry
1 answer:
34kurt3 years ago
8 0

Answer:

Mass = 0.008 g

Explanation:

Given data:

Volume of H₂ = 107 mL

Pressure = 104.8 KPa

Temperature = 30°C

Mass of H₂ present = ?

Solution:

Formula:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

Now we will convert the units of temperature, pressure and volume.

Temperature  = 30+273 = 303 K

Volume of H₂ = 107 mL (107/1000= 0.107 L)

Pressure = 104.8 KPa (104.8/101 = 1.04 atm)

by putting values,

1.04 atm ×0.107 L = n× 0.0821 atm.L/ mol.K  × 303 K

0.11 atm.L  = n×24.87 atm.L/ mol

n =  0.11 atm.L / 24.87 atm.L/ mol

n = 0.004

Mass of H₂:

Mass = number of moles × molar mass

Mass =   0.004    mol × 2 g/mol

Mass = 0.008 g

You might be interested in
How well does particle theory explain the properties of solids liquids and gases?
skad [1K]

Answer:

The kinetic particle theory explains the properties of the different states of matter. The particles in solids, liquids and gases have different amounts of energy. They are arranged differently and move in different ways.

Explanation:

Hope it helps you

5 0
2 years ago
2KCIO3 -2KCL + 302
Firlakuza [10]

Answer:

a. 6 moles of O₂

b. 4.06×10²⁴ molecules of O₂

c. 3.04 g of KCl

Explanation:

Reaction of decomposition is:

2KClO₃  →  2KCl  +  3O₂

a. See stoichiometry value

2 moles of potassium chlorate can decompose to 2 moles of potassium chloride and 3 moles of oxygen. Ratio is 2:3

If 2 moles of KClO₃ can decompose to 3 moles of O₂

Then 4 moles, may decompose to (4 . 3)/2 = 6 moles of O₂

b. In this case, the stoichiometry is the same.

Per 2 moles of KClO₃, I produce 2 moles of KCl

Then, 4.5 moles of KCl, were produced by 4.5 moles of KClO₃

We apply, the last relation:

(4.5 . 3) /2 = 6.75 moles of O₂ are also produced.

How many molecules are in 6.75 moles?

6.75 mol . 6.02×10²³ molecules/mol = 4.06×10²⁴ molecules of O₂

c. First of all, we convert the mass to moles:

5g . 1mol /122.55g = 0.0408 moles of salt

As ratio is 2:2, 0.0408 moles of salt, decompose to 0.0408 moles of KCl

We convert the moles to mass: 0.0408 mol . 74.55g /mol = 3.04g

5 0
2 years ago
What is the only nonmetal with four valence electrons.
Alja [10]

Carbon is a non metal and also has four valence electrons.

3 0
2 years ago
For the reaction of sodium bromide with chlorine gas
lina2011 [118]

The reaction of sodium bromide with chlorine gas is Cl₂(aq) + 2Na + 2Br? 2Na + 2Cl⁻ + Br²(aq).

<h3>What is sodium bromide?</h3>

Sodium bromide is an inorganic compound, white, crystalline with high melting point.

The reaction between halogens is redox reaction

Oxidation  – 2Br⁻ ? Br₂ + 2e⁻ loss of electron.

Reduction – Cl₂ + 2e⁻ ? 2Cl⁻ gains of electron.

Thus, the correct option is Cl₂(aq) + 2Na + 2Br? 2Na + 2Cl⁻ + Br²(aq).

Learn more about sodium bromide

brainly.com/question/15409724

#SPJ4

7 0
1 year ago
Who earned a Nobel Peace Prize for their study of the photoelectric effect?
riadik2000 [5.3K]
ALBERT ENSTIEN !!!!!
5 0
3 years ago
Other questions:
  • A sample of gas occupies a volume of 73.7 mL. As it expands, it does 133.7 J of work on its surroundings at a constant pressure
    8·1 answer
  • Covalent solutes are considered non-electrolytes. What does this mean for the conductivity of the solution?
    6·2 answers
  • PLEASE HELP IM STUGGLING
    8·1 answer
  • What are the laws of Newton?
    8·2 answers
  • My teacher gave this assignment for homework, and I don’t get it. A little help please?
    13·1 answer
  • Which statements are scientific statements? Select all the correct answers. People who drive red cars are more prone to accident
    15·1 answer
  • Which statements are correct about Avogadro’s constant?
    13·1 answer
  • Hey guys you should all call this number and leave a funny voicemail
    7·1 answer
  • Plz help..<br> How to name alcohols...
    9·2 answers
  • Which statement best describes the Sun-Earth-Moon system during a spring
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!