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
DedPeter [7]
3 years ago
5

C. Another radioisotope of americium exists which has an atomic mass of 242.

Chemistry
1 answer:
ollegr [7]3 years ago
7 0

Answer:

1 g  

Explanation:

The half-life of Am-242 (16 h) is the time it takes for half of it to disappear.

We can make a table of the mass left after each half-life.

\begin{array}{cccc}\textbf{No. of} & & \textbf{Percent} & \textbf{Mass}\\\textbf{Half-lives} & \textbf{Time/h} & \textbf{Remaining} & \textbf{Remaining/g}\\0& 0 & 100 & 8\\1 & 16 &50 & 4\\2 & 32 & 25 & 2\\3 & 48 & 12.5 & 1\\4 & 64 & 6.25 & 0.5\\\end{array}

The mass remaining after 48 h  is 1 g.

You might be interested in
Determine the equilibrium constant for the acid-base reaction between ethanol and hydrobromic acid? Acid pKa Hydrobromic Acid −5
siniylev [52]

Answer:

10^{-3.4

Explanation:

Let us first take a look at the image below;

In the acid - base  reaction; we can see the transfer of electrons that takes place;

We can also see that the reaction goes in the direction which converts the stronger acid and the stronger base to the weaker acid and the weaker base.

The stronger acid is shown with the one with more negative P_{Ka} Value.

∴ The equilibrium constant for the acid-base reaction is expressed as:

K_{eq}= \frac{K_a of reactant acid}{K_a of product acid}

      = \frac{10^{-pK} of reactant acid}{10^{-pk} of product acid}

From  P_{Ka} Value (shown in the image below), it is clear and vivid that hydrobromic acid is a stronger acid than the ethyloxonium ion, therefore the equilibrium lies to the right.

From the chemical equation (shown in the attached image); the equilibrium constant for the acid-base reaction can be expressed as:

K_{eq}=\frac{10^{-pK} of hydrobromic acid}{10^{-pk} of Ethyloxonium acid}

K_{eq}=\frac{10^{-5.8} of hydrobromic acid}{10^{-2.4} of Ethyloxonium acid}

       = 10^{-3.4}

6 0
3 years ago
How many ions in 6.41 moles of K2O? Please show work.
Oksana_A [137]
1. Convert the number of moles to number of particles (divide 6.41 by 6.022 x 10^23)

2. K2O dissociates into three ions (2 potassium ions and 1 oxide ion), so multiply the result from step 1 by 3 to get your answer
4 0
3 years ago
Help! The question is in the picture
Ronch [10]

Answer:

little l big l big l little l

Explanation:

can you help me Complete the following sentence: After we explained why we needed her in the play, she and joined our rehearsal A quaffed B. acquiesced C vengeance D. wreaked

4 0
2 years ago
A chemical reaction has an equilibrium constant of 2*10^6. If this reaction is at equilbrium, select the one corect conclusion t
VashaNatasha [74]

Answer:

idk

Explanation:

idk

3 0
3 years ago
A variable is something that can never be changed in an experiment. <br> False<br> True
Agata [3.3K]
I’m pretty sure it true
3 0
3 years ago
Other questions:
  • After raining when do rain drops dry away easily on a cloudy day or on a sunny day? explain
    5·2 answers
  • How many grams of CO2 are in 7 mol of the compound? PLEASE EXPLAIN
    13·1 answer
  • A student pushes a 40-N block across the floor for a distance of 10 m.
    9·1 answer
  • What is the difference between traffic lights with red arrows and those with solid red lights?
    14·1 answer
  • Atmospheric pressure arises due to the force exerted by the air above the Earth. At higher altitudes, the mass of the air above
    15·1 answer
  • Answer A B C and D please for my chemistry hw
    11·1 answer
  • How many grams of sodium are in<br> 1.000 mole of sodium?
    13·2 answers
  • Based on your observations and your understanding about how heat moves (from hot to cold), write a hypothesis that describes whi
    15·1 answer
  • If an atom has 15 protons, 14 neutrons, and 18 electrons, what is the atom's electrical charge?
    10·1 answer
  • Suppose you found an unknown substance in a laboratory. It has the formula H2O2 written on the bottle. Is it water? How do you k
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!