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
salantis [7]
3 years ago
14

After two half-lives, a sample contains 10 grams of parent isotopes. How many grams of the parent isotope were present to start?

Chemistry
2 answers:
Lunna [17]3 years ago
8 0
T=2T
m=10 g

m=m₀2^(-t/T)

m₀=m/{2^(-2T/T)=m/2⁻²

m₀=10/2⁻²=40 g

40 grams
almond37 [142]3 years ago
8 0
Theirs a total of 39.9999G at the start
You might be interested in
PLEASE HELP ME
ki77a [65]

Answer:

1.15 atm

Explanation:

According to Dalton's law of partial pressures, the total pressure is the sum of all the partial pressures of the gases present in the mixture.

Therefore we have:

Total pressure = partial pressure of carbon monoxide + partial pressure of oxygen + partial pressure of carbon dioxide

We were given the following:

Total pressure = 2.45 atm

Pressure of oxygen = 0.65 atm

Pressure of carbon monoxide = x

Pressure of carbon dioxide = 0.65 atm

Therefore:

2.45 = x + 0.65 + 0.65

2.45 = x + 1.3

x = 2.45 - 1.3

x = 1.15 atm

6 0
3 years ago
HELP!!!! I WILL MARK BRAINLIEST WHOEVER ANSWERS FIRST
ELEN [110]

Answer:

I answered first, give me brainliest

Explanation:

8 0
2 years ago
When the plutonium bomb was tested in New Mexico in 1945, approximately 1 gram of matter was converted into energy. Suppose anot
stiv31 [10]

Answer:

See explanation

Explanation:

Given Einstein's theory of relativity, we have that;

E= mc^2

m= mass of the substance

c= speed of light

For one gram of the substance,

E= 1 ×10^-3 × (3 × 10^8)^2

E = 9 × 10^13 J

For 8.7 g of matter;

E = 8.7 × 10^-3× (3 × 10^8)

E= 7.83 ×10^ 14 J

6 0
3 years ago
A company is designing a new range of saucepans. The base of the saucepan should
earnstyle [38]
D)plastic copper
......................
5 0
3 years ago
Read 2 more answers
1. Identify the reactants in this chemical equation:<br> 2H2 + O2 + 2H2O
USPshnik [31]
Oxygen and hydrogen
6 0
3 years ago
Other questions:
  • How many atoms are in 2 Fe?<br> 1<br> 2<br> 3<br> 4
    10·1 answer
  • In 1897, Joseph Thomson discovered that atoms contained electrons. He proposed a change in the atomic theory of that time, and t
    12·1 answer
  • What is the ground-state electronic configuration of a chlorine anion (cl—)?
    13·1 answer
  • Iron (Fe) has three isotopes. Calculate the average atomic mass of the element Fe using the following data: Isotope atomic mass
    7·1 answer
  • What does an elements location tell us about the forces within an atom?
    5·1 answer
  • The potential energy diagram shows the gain and loss of potential energy as water molecules decompose into hydrogen and oxygen.
    5·2 answers
  • Compounds are different than elements because compounds are–
    14·1 answer
  • At 258C, Kp 5 2.9 3 1023 for the reactionNH4OCONH21s2m 2NH31 g21 CO21 g2In an experiment carried out at 258C, a certain amount o
    11·1 answer
  • Bonding Story Mini Project
    14·1 answer
  • If the car still produces 8500N, but now it accelerates at only 4 m/s2 what is the MASS
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!