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
elena-14-01-66 [18.8K]
2 years ago
14

The half-life of 131I is 80 days. How much of a 500.0 mg sample remains after 3 half lives?

Chemistry
1 answer:
I am Lyosha [343]2 years ago
6 0

Answer:

62.5 mg

Explanation:

Just multiply the original amount by  1/2   three times:

500 mg  x  1/2  x  1/2  x  1/2 = 62.5 mg

You might be interested in
Which of the following is a benefit of having a standard measurement system that can be used by scientists worldwide?
bonufazy [111]
2. Scientists can compare and share data with each other. 

By making use a standard measurement system scientists can accurately share data with one another and use this as the basis for further scientific research .

For example a scientist can further research an experiment by simply using a standard measurement or conversion to better or even perfect an experiment .
6 0
3 years ago
7. What do all elements in the same period on the periodic table have in common?
zalisa [80]

Answer:

they have same number of electrons

6 0
2 years ago
Help ..... a chemical equation for this problem ..:
baherus [9]
Ag+1and S-2and then you have to offset it..because Ag has one positive charge and S has 2 negative charges you then need one more Ag+1 to cancelled out the charges with S-2 as result the formula is Ag2S
3 0
3 years ago
The density of molasses is 2.28g/mL. What volume of molasses would have a mass of 392.8g?
andreev551 [17]

Answer:

V = 172.28 mL

Explanation:

density is mass divided by volume

p = density

m = mass

V = volume

p = m/v

V = m/p

V = 392.8/2.28

V = 172.28 mL

3 0
3 years ago
Is H20 a balanced equation?
Nat2105 [25]

Answer:

no it's not

Explanation:

because H2+O2=H2O

so the balanced form is

H2 +O2=2H2O

8 0
3 years ago
Other questions:
  • A compound with a specific number of water molecules bound to its formula unit is called a
    11·1 answer
  • If a gas is moved from a large container to a small container but its temperature and number of moles remain the same, what woul
    10·2 answers
  • How many atoms are in 44 grams of sulfur?
    6·1 answer
  • Complete the following precipitation reaction with balanced molecular, total ionic, and net ionic equations. Remember to include
    11·1 answer
  • Which of the following values displays the pH of a base?
    11·1 answer
  • Help me for brainlest and 100 point
    7·2 answers
  • What happens when a copper vessel is exposed to moist air for long? please answer fast​
    14·1 answer
  • Given that a 3cm lenght of magnesium weights approximately 0.04g, calculate the number of moles of acid that reacted with the 9c
    11·1 answer
  • Compared to compounds with network structures, compounds arranged in molecules (covalent bonds) have ____________ melting points
    12·1 answer
  • 1. we used __________ to represent an element.
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!