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
2. Most species fail in new environments because of.
EastWind [94]

Most species fail in new environments because of: Low population numbers

8 0
3 years ago
Which option is an example of a chemical property?
Alona [7]
Answer:
The ability to decompose
Explanation:
A property is a chemical property when it changes the chemical structure of a substance after a reaction.
Density and color are both physical properties.
Even though melting point may seem like a chemical property, when something melts, only the physical state changes, and the chemical structure does not change, and therefore, is a physical property.
The ability to decompose is a chemical property. When something decomposes, the chemical structure of many molecules change, and therefore, is classified as a chemical property.
8 0
3 years ago
Read 2 more answers
4. How many moles of KBr are found in 3 Liters of 0.4 M solution?
Allisa [31]

There are 1.2 moles of KBr found in 3 Liters of 0.4 M solution.

<h3>HOW TO CALCULATE NUMBER OF MOLES?</h3>

The number of moles of a substance can be calculated by multiplying the molarity by the volume.

No. of moles = Molarity × volume

According to this question, 3L of a KBr solution are contained in a 0.4M.

no. of moles = 3L × 0.4M = 1.2moles

Therefore, there are 1.2 moles of KBr found in 3 Liters of 0.4 M solution.

Learn more about no. of moles at: brainly.com/question/14919968

4 0
3 years ago
Now that you have the knowledge of the highest specific heat capacity and lowest porosity, which material would you choose to bu
Svet_ta [14]

Answer:

Now that you have the knowledge of the highest specific heat capacity and lowest porosity, which material would you choose to build Rover's new doghouse roof?

Oak has the highest heat capacity; therefore, oak can absorb a lot of heat without raising its temperature. This is good for very hot areas. Concrete has the lowest porosity so water will not leak through its pores and drip into the doghouse. This is good for rainy areas. However, clay is second on both lists and might be a good choice overall for hot and rainy weather conditions. Rover should be happy with this.

xXxAnimexXx

Have a great day!

7 0
3 years ago
Read 2 more answers
2. An element is all the way through,​
elena55 [62]
?? Is that the whole question?
6 0
3 years ago
Other questions:
  • If 38g of sodium hydroxide reacts with 28g of carbon, how many grams of sodium carbonate are produced?
    11·1 answer
  • Isotopes of the same element have different numbers of ________.
    9·2 answers
  • Which of the following is a physical change?
    15·1 answer
  • Sodium chromate is used to protect iron from corrosion and rusting. determine its formula mass. 261.97 amu 238.98 amu 74.99 amu
    13·1 answer
  • Which solution when mixed with a drop of bromthymol blue will cause the indicator to change from blue to yellow
    12·1 answer
  • What is a primary consumer
    15·2 answers
  • Why are the electrons in metallic bonding referred to as “ delocalized”?
    10·1 answer
  • PLEASE HELP URGENT!!!! ( photo included)
    15·1 answer
  • IMMA WAIT FOR MY BABY EVEN IF IT TAKES ALL NIGHT !!!!!!
    9·2 answers
  • help please this is a major grade (my birthday is next week) if i dont pass i wont celebrate my birthday please help!
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!