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
frosja888 [35]
3 years ago
13

The half-life of bismuth is 5 days. How much of a 100 gram sample will remain after 20 days?

Chemistry
1 answer:
sesenic [268]3 years ago
8 0
Half-life is the duration needed for a compound to decay into half of its initial weight. In this case, the initial weight is 100gram. The calculation for the final weight should be:

final weight= initial weight * (1/2)^(duration/half-life)
final weight= 100 grams * (1/2)^(20days/5 days)
final weight= 100 grams * (1/2)^(4)
final weight= 100 * 1/16= 100/16 gram= 6.25 grams

You might be interested in
Earth is located in which galaxy?
Phoenix [80]

Answer:

Earth is located in the milky way galaxy

5 0
3 years ago
Read 2 more answers
The development of nuclear power has provided electricity for less money, but at a cost. What may be considered a "cost" of nucl
Schach [20]
D. A disadvantage of nuclear power is that waste products are unsafe and hard to store. They must be stored for many hundreds of years before they becomes safe and easier to dispose of, and we currently don't have a good method of storing them in the meantime.


4 0
3 years ago
Read 2 more answers
a chemist dissolves 0.564 moles of manganese (IV) oxide (MnO2) in water, and adds enough water to make 0.510 L of solution. Calc
ladessa [460]

Answer:

The molarity of the solution is 1.1 \frac{moles}{liter}

Explanation:

Molarity is a measure of the concentration of that substance that is defined as the number of moles of solute divided by the volume of the solution.

The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:

molarity=\frac{number of moles of solute}{volume}

Molarity is expressed in units \frac{moles}{liter}

In this case

  • number of moles of solute= 0.564 moles
  • volume= 0.510 L

Replacing:

molarity=\frac{0.564 moles}{0.510 L}

Solving:

molarity= 1.1 \frac{moles}{liter}

<u><em>The molarity of the solution is 1.1 </em></u>\frac{moles}{liter}<u><em></em></u>

4 0
2 years ago
All of the following conditions of STP are true except A. 101.3 kPa B.3.81kPa.L/mol.K C. 24.2 L D. 273.15 K
Tasya [4]
The answer is c 24.2l
6 0
2 years ago
Read 2 more answers
Which of the following is formed by intense heat and pressure over millions of years?
kumpel [21]

Answer:

B:Metamorphic

Explanation:

Rocks formed under high heat and pressure is essentially the definition of metamorphic rock :)

8 0
3 years ago
Other questions:
  • The incomplete table below shows selected characteristics of gas laws.
    15·2 answers
  • The specific heat of aluminum is 0.900 J/gº C. A 400.0 g sample of aluminum at 20.0º C absorbs 2520. J of heat energy. What is t
    10·1 answer
  • 1.<br> How<br> many atoms of Li are there in 7.5 moles of Li?
    7·1 answer
  • When magma reaches the surface gases what out of it
    7·1 answer
  • A 0.100 L sample of an unknown HNO3 solution required 51.3 mL of 0.250 M Ba(OH)2 for complete neutralization. What is the concen
    12·1 answer
  • What do scientists do during data collection?
    15·2 answers
  • The mineral rhodochrosite [manganese(II) carbonate, MnCO3] is a commercially important source of manganese. Write a half-reactio
    7·1 answer
  • If 5.00 g of O2 gas has a volume of 7.20 L at a certain temperature and pressure, what volume does 15.0 g of O2 have under the s
    11·1 answer
  • 3. Type: MT
    9·1 answer
  • Which is more massive, the nucleus OR empty space?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!