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
katovenus [111]
3 years ago
15

I need help on this one plizz help me

Chemistry
1 answer:
Aleksandr-060686 [28]3 years ago
5 0
Multiply,
moles * molar mass = mass
You might be interested in
Create a time that marks important events during the Precambrian Supereon.
Maurinko [17]
I really hope this help!!
8 0
2 years ago
Read 2 more answers
A sample contains 25% parent isotope and 75% daughter isotopes. If the half-life of the parent isotope is 72 years, how old is t
alisha [4.7K]

The radioactive decay obeys first order kinetics

the rate law expression for radioactive decay is

ln\frac{[A_{0}]}{[A_{t}]}=kt

Where

A0 = initial concentration

At = concentration after time "t"

t = time

k = rate constant

For first order reaction the relation between rate constant and half life is:

k=\frac{0.693}{t_{\frac{1}{2} } }

Let us calculate k

k = 0.693 / 72 = 0.009625 years⁻¹

Given

At = 0.25 A0

ln(\frac{A0}{0.25A0})=0.009625  X time

time = 144 years

So after 144 years the sample contains 25% parent isotope and 75% daughter isotopes**

Simply two half lives

5 0
2 years ago
Read 2 more answers
The __lithosphere__ combines the two crusts, oceanic and continental, with the coolest part of the __________________. The asthe
zmey [24]

Answer:

The lithosphere And the upper mantle combines the two crusts, oceanic and continental, with the coolest part of the Crust?. The asthenosphere allows the tectonic plates to slide on the putty substance of the mantle and the mesosphere is the Smallest? part of the mantle. The outer core is hot enough to turn the metal into a Liquid The inner core is the hottest but the extreme pressure makes it a Solid.

8 0
2 years ago
Read 2 more answers
34. The line shows the path of the ball.
kiruha [24]
C. Potential to kinetic
6 0
3 years ago
Read 2 more answers
Which change can be easily be reversed? question 23 options: both a physical and chemical change chemical change physical change
givi [52]
Physical change .. you cannot undo chemical ... physical is like bending , shattering a mirror , denting something ..
chemical would be rust or something .

6 0
3 years ago
Other questions:
  • Which equation demonstrates that nuclear fusion forms elements that are heavier than helium?
    10·1 answer
  • How could you determine whether one of these two suspected compounds was identical to the unknown compound without using any for
    10·1 answer
  • Aluminum and iron (II) oxide combine to form iron and aluminum oxide.
    9·1 answer
  • Reptiles, amphibians, and fish are all cold-
    5·2 answers
  • Hof metal plate at 150°C has been placed in air at room temperature. Which event would most likely take place over the
    7·1 answer
  • Which statement best describes a chemical property of Iron?
    6·2 answers
  • En 200 gramos de carburo de potasio ,cuya fórmula química es K4C , Cuántos moles de esa sustancia existen ?
    9·1 answer
  • How many ATOMS are in 7.32 moles of sulfur<br> dioxide?
    13·1 answer
  • Help me please !!!!!!8th grade science
    11·1 answer
  • If you dissolve 20 mL of flavor crystals into 250 mL of water to make lemonade, what volume of lemonade do you expect to have? W
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!