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
marissa [1.9K]
2 years ago
11

25 grams of radon-222 remains after 15.28 days. How much radon was in the original sample? Write an equation for the decay of ra

don-222.
Chemistry
1 answer:
Crazy boy [7]2 years ago
8 0

Answer:

half-life = 3.8 days

total time of decay = 15.2 days

initial amount = 100. g

number of half-lives past: 15.2/3.8 = 4 half-lives

4 half-lives = 1/16 remains

100. g x 1/16 = 6.25 g

You might be interested in
What does a banana have that a human does not?
Vikentia [17]
It would be a face or toes
7 0
3 years ago
Read 2 more answers
If 9.9L of helium are in a tire at 303k,how many liters will be present at 403k if the pressure is held constant.
Slav-nsk [51]

Answer:

Final volume, V2 = 13.18 Liters

Explanation:

<u>Given the following data;</u>

Initial volume = 9.9 L

Initial temperature = 303 K

Final temperature = 403 K

To find the final volume, we would use Charles law;

Charles states that when the pressure of an ideal gas is kept constant, the volume of the gas is directly proportional to the absolute temperature of the gas.

Mathematically, Charles' law is given by the formula;

VT = K

\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}

Where;

  • V1 and V2 represents the initial and final volumes respectively.
  • T1 and T2 represents the initial and final temperatures respectively.

\frac{V1}{T1} = \frac{V2}{T2}

Making V2 as the subject formula, we have;

V_{2}= \frac{V1}{T1} * T_{2}

V_{2}= \frac{9.9}{303} * 403

V_{2}= 0.0327 * 403

<em>Final volume, V2 = 13.18 Liters</em>

8 0
3 years ago
Write a chemical equation for nh4+(aq) showing how it is an acid or a base according to the arrhenius definition.
GuDViN [60]

An Arrhenius acid by definition dissociates in water to form H3O+ (or H+) ions while an arrhenius base dissociates in water to form OH- ions.

NH4+(aq) can be categorised as an arrhenius acid since it releases H3O+ ions in aqueous media

NH4+(aq) + H2O (aq) ↔ NH3 (aq) + H3O+(aq)

3 0
3 years ago
Read 2 more answers
How many moles of water can be produced by reacting 525 liters of oxygen with excess hydrogen
Ann [662]
I believe the answer is 16
3 0
2 years ago
How many moles of Ar gas are<br> present in a container with a<br> volume of 78.4 L at STP?
rusak2 [61]
<h3><u>Answer:</u></h3>

<u>1 mole of a gas at STP occupies 22.4 L volume </u>

<u>Now the volume is given =78.4 therefore,</u>

<u>No. of moles of gas = 78.4 ÷ 22.4 = 3.5 moles</u>

<u>I hope it helps you~</u>

7 0
2 years ago
Other questions:
  • What are the characteristics of a virtual image? Check all that apply.
    14·2 answers
  • Which expression is equal to the number of milliliters(mL)in 12.5 liters(L)?
    7·2 answers
  • Identify the playwright--Aeschylus, Sophocles, Euripides, or Aristophanes--described in the following statement. 4. (1 pt) Only
    7·1 answer
  • A molecule with the formula ch3ch(nh2)cooh probably exhibit which of the folloiwng characteristics
    11·1 answer
  • Distilled water has a hydronium ion concentration of 1 × 10–7 M. What is the pH of distilled water?
    12·1 answer
  • The concentration of a solute in a solution is greater than the maximum concentration that is predicted from the solute's solubi
    12·1 answer
  • Mass is:
    13·2 answers
  • Identify the conjugate base in each pairs
    14·1 answer
  • Which of the following is a compound?<br> Gold<br> Silver<br> Carbon Dioxide<br> Lead
    11·1 answer
  • What happened to Mendeleev's mother after he was accepted into St. Petersburg University?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!