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
LiRa [457]
3 years ago
5

The first-order decay of radon has a half-life of 3.823 days. How many grams of radon remain after 7.22 days if the sample initi

ally weighs 250.0 grams?
Chemistry
1 answer:
Nesterboy [21]3 years ago
6 0

substitute: <span><span>t<span>1/2</span></span>=<span><span>ln(2)</span>k</span>→k=<span><span>ln(2)</span><span>t<span>1/2</span></span></span></span> Into the appropriate equation: <span>[A<span>]t</span>=[A<span>]0</span>∗<span>e<span>−kt</span></span></span> <span>[A<span>]t</span>=[A<span>]0</span>∗<span>e<span>−<span><span>ln(2)</span><span>t<span>1/2</span></span></span>t</span></span></span> <span>[A<span>]t</span>=(250.0 g)∗<span>e<span>−<span><span>ln(2)</span><span>3.823 days</span></span>(7.22 days)</span></span>=67.52 g</span>

You might be interested in
How many grams of H 2O are produced from 28.8 g of O 2? (Molar Mass of H 2O = 18.02 g) (Molar Mass of O 2=32.00 g) 4 NH 3 (g) +
krek1111 [17]

Answer:  13.9 g of H_2O will be produced from the given mass of oxygen

Explanation:

To calculate the moles :

\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}    

\text{Moles of} O_2=\frac{28.8g}{32.00g/mol}=0.900moles

The balanced chemical reaction is:

4NIO_2(g)+7O_2(g)\rightarrow 4NO_2(g)+6H_2O(g)

According to stoichiometry :

7 moles of O_2 produce =  6 moles of H_2O

Thus 0.900 moles of O_2 will produce =\frac{6}{7}\times 0.900=0.771moles  of H_2O

Mass of H_2O=moles\times {\text {Molar mass}}=0.771moles\times 18.02g/mol=13.9g

Thus 13.9 g of H_2O will be produced from the given mass of oxygen

5 0
3 years ago
What does a nubula turn into
LekaFEV [45]

Answer:

a white dwarf

Explanation:

6 0
3 years ago
Combining hydrogen and oxygen to make water is a physical change
shutvik [7]

id say physical cause your changing the physical form of the molucles

3 0
2 years ago
If 2.65 mol of O2 gas has a volume of 49.0 L at 180 C, what is the pressure of the gas?
adoni [48]

Answer:

2.01atm

Explanation:

5 0
3 years ago
What is the Molar Mass
Natasha2012 [34]
The molar mass<span> is the </span>mass<span> of a  chemical element or a chemical compound (g) divided by the amount of substance (mol).

Hope this helps!</span>
5 0
3 years ago
Read 2 more answers
Other questions:
  • According to the american academy of pediatric dentistry, you should make sure your toothpaste has
    5·2 answers
  • A 55.0 mL aliquot of a 1.50 M solution is diluted to a total volume of 278 mL. A 139 mL portion of that solution is diluted by a
    8·2 answers
  • In a combustion reaction, ethanol (C2H5OH) is burned in the presence of oxygen (O2), producing carbon dioxide (CO2) and water (H
    13·1 answer
  • Cryosphere definition earth science
    11·2 answers
  • What is considered to be a physical property of matter
    13·1 answer
  • I need help. It’s due tonight. Thanks
    5·2 answers
  • 18 POINTS I'LL DO BRAINLIEST Which is the best reason for not using a moving car as a reference point?
    7·1 answer
  • How many mL of 0.125 M Ba(OH)2 would be required to completely neutralize 75.0 mL of 0.845 M HCl? What is the pH of the solution
    5·1 answer
  • What's a third reaction? (Chemistry)
    8·1 answer
  • Based on the information that is given, which atom is the table ?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!