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
Alenkinab [10]
3 years ago
13

What is the mass of 18.8 moles of helium atoms?

Chemistry
1 answer:
Firlakuza [10]3 years ago
5 0
18.8 mol= mass of He X atomic mass
18.8 mol= mass of He X 4 g mol^-1
mass of He= (18.8 X 4)g = 75.2 g
You might be interested in
What is the significance of the Galápagos Islands to the theory of evolution
Aloiza [94]
The importance of the Galapagos to Darwin theory is chances  Darwin discovered several species of finches that varied from island to island .
A big part of reason it is so famous is because of Darwin finches.
which are 12 <span>species ,also the Darwin theory is  only gradually accepted because people don't believe in them today</span>
3 0
3 years ago
A solution of rubbing alcohol is 68.6 % (v/v) isopropanol in water. How many milliliters of isopropanol are in a 88.2 mL sample
KonstantinChe [14]


From the information given, the total volume of  rubbing alcohol is 88.2 ml

68.6 % of this volume is isopropanol. 

We will assume 88.2 ml represents 100% volume, so the volume of water will be 31.4 %

The volume of isopropanol is

68.6/100 x 88.2 → 0.686 × 88.2 = 60.505 ml

The volume of isopropanol is 60.5 ml.

Volume of water will be 88.20 - 60.5 = 27.7 ml

(27.7 / 88.2 × 100 = 31.4% )

Adding 60.5 ml of isopropanol to 27.7 ml of water to make up 88.2 ml will give 68.6 % v/v isopropanol to water  solution.



8 0
3 years ago
Which two changes of state can be caused by removing thermal energy from a substance? choose two
crimeas [40]

Answer:

B and C

Explanation:

The correct answer is Condensation and Deposition

4 0
3 years ago
Read 2 more answers
What important processes in your body depend on mitosis
PilotLPTM [1.2K]
Mitosis makes new cells and replaces the cells that are old, lost or damaged
3 0
3 years ago
What evidence supports a conservation law?
Murljashka [212]

Answer:

A- Energy from sunlight becomes glucose during photosynthesis

Explanation:

The law of conservational photosynthetic energy states that atoms cannot be created nor destroyed; the atoms can only be rearranged into new molecules and ions. This implies that the enzymes in photosynthesis are aided by energy to transform into glucose, which the plant needs.

5 0
2 years ago
Read 2 more answers
Other questions:
  • By what mechanism does cyclohexanol react when treated in sulfuric acid and what compound results?A) E 1; methoxycyclohexane B)
    6·1 answer
  • An object was measured by a worker as 14.6 cm long, however, the manufacturer specifications list the length of the object at 14
    9·1 answer
  • Which of the following phase changes would release energy as it occurs? (4 points) Melting
    9·1 answer
  • What can happen when earth materials overcome the force of friction holding them together?
    11·1 answer
  • When there are more electrons than protons an object has an overall<br> charge.
    15·1 answer
  • Rick runs 100 feet in 20 seconds what’s his speed?
    6·2 answers
  • Identify the atom provided. *<br> Boron<br> Phophorus<br> Sulfer<br> Aluminum
    6·1 answer
  • Please help it’s due by midnight I’ll mark you brainiest if you’re able to help
    14·1 answer
  • Why is it necessary to standardize a secondary standard before use?<br>​
    13·1 answer
  • One type of electromagnetic radiation has a frequency of 107.1MHz,another type has wavelength of of 2.12x10^-10 m,and another ty
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!