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
Artist 52 [7]
3 years ago
9

The half-life of 42K is 12.4 hours. How much of a 750.0-gram sample is left after 62.0 hours?

Chemistry
1 answer:
Illusion [34]3 years ago
4 0

Answer: 23 g

Explanation:

Amountafter = Amountbefore * (1/2)^(t/thalf)

Amountafter = (750 grams) * (1/2)^(62.0 hours/12.4 hours)

Amountafter = 23.4375 grams

750 has 2 significant digits

12.4 and 62.0 have 3 significant digits

So we take the lower of 2 significant digits:

23 grams

You might be interested in
An organism that regulates its body temperature using external heat sources is an example of
katovenus [111]
A cold-blooded animal. Cold-blooded animals can't generate heat themselves so they have to use external sources to keep them warm.
6 0
4 years ago
Read 2 more answers
Rank the following aqueous solutions from highest to lowest freezing point: 0.1 m FeCl3, 0.30 m glucose (C6H12O6), 0.15 m CaCl2.
Tresset [83]

Answer:

Explanation: See images below for explanation

8 0
4 years ago
consider this reaction at equilibrium at a total pressure: 2h2o(g) o2(g) 2h2o2(g) suppose the volume of this system is twice its
Daniel [21]

The total pressure when the new equilibrium is stabilized is half of the initial pressure of the system.

The given chemical reaction at a stable equilibrium is,

2H₂O(g)+O₂(g) = 2H₂O₂(g)

According to the ideal gas equation,

PV = nRT

P is pressure,

V is volume,

n is moles

R is gas constant,

T is temperature.

Assuming the temperature is constant.

If the volume of the system is twice the initial volume then the total pressure at the new equilibrium can be found out as,

P₁V₁ = P₂V₂

Where, P₁ and V₁ are initial volume and pressure while P₂ and V₂ are final pressure and volume.

If V₂ = 2V₁,

P₂ = P₁/2

So, the final total pressure will be half of the initial pressure.

To know more about equilibrium, visit,

brainly.com/question/517289

#SPJ4

5 0
1 year ago
Consider four different samples: aqueous LiBr , molten LiBr , aqueous AgBr , and molten AgBr . Current run through each sample p
Charra [1.4K]

Answer:

a) Aqueous LiBr = Hydrogen Gas

b) Aqueous AgBr = solid Ag

c) Molten LiBr = solid Li

c) Molten AgBr = Solid Ag

Explanation:

a) Aqueous LiBr

This sample produces Hydrogen gas, because the H+ (conteined in the water) has a reduction potential higher than the Li+ from the salt. Therefore the hydrogen cation will reduce instead of the lithium one and form the gas.

b) Aqueous AgBr

This sample produces Solid Ag, because the Ag+ has a reduction potential higher than the H+ from the water. Therefore the silver cation will reduce instead of the hydrogen one and form the solid.

c) Molten LiBr

In a molten binary salt like LiBr there is only one cation present in the cathod. In this case the Li+, so it will reduce and form solid Li.  

c) Molten AgBr

The same as the item above: there is only one cation present in the cathod. In this case the Ag+, so it will reduce and form solid Ag.  

6 0
4 years ago
What did you include in your response?<br>check all that apply ​
erma4kov [3.2K]

Answer: i don't know

Explanation:

u gave no information on what you're asking

6 0
3 years ago
Other questions:
  • What is the mass percent of a solution of 7.6 grams sucrose in 83.4 grams of water
    9·1 answer
  • How many structural isomers are possible for compounds with a molecular formula c4h10?
    11·1 answer
  • How many molecules are in 0.26 mol of CO2
    14·1 answer
  • What will for if sodium give away one electron ?
    6·1 answer
  • How does bohr's model differ from rutherford's model??
    11·1 answer
  • When a positive ion is formed, the resulting ion is
    10·1 answer
  • What is the density of an object whose mass is 120 grams and whose volume is 60 cm3? (D=m/v)
    15·2 answers
  • M= 2 kg, a = 2 m/s^2. <br><br> Find F
    13·1 answer
  • Help me with this please! Do not say "I don't know" to get my points!!!!!!! It is not helpful and disrespectful. THANKS!
    6·1 answer
  • A sample of quartz, which has a specific heat capacity of , is dropped into an insulated container containing of water at and a
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!