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
neonofarm [45]
3 years ago
9

Why is it useful to use moles to measure chemical quantities?

Chemistry
1 answer:
PtichkaEL [24]3 years ago
6 0
It takes into account the different molecular masses of the different chemicals by providing a fixed and standardised number of molecules/ atoms for chemicals to be measured
You might be interested in
What is the rate law?
nikdorinn [45]

Answer: B

Explanation:

The rate law is the mathematical equation that describes how reactant concentration changes as a function of time. A law such as "Rate = k*[A]*[B]" means that, for each liter-equivalent of the reactant(s) A, there are k liters of reactant B. The law also dictates the molarity (and thus partial pressure) for each component in solution.

7 0
3 years ago
The radioisotope potassium-40 decays to argon-40 by positron emission with a half-life of 1.3 Ã 109 yr. A sample of moon rock wa
Aloiza [94]

Answer:

4.66 x 10^8 yr

Explanation:

The age of the rock can be calculated using the equation:

ln (N/N₀) = - kt    where N is the quantiy of radioisotope decayed and N₀ is the initially quantity present of the radioisotope; k is the decay constant, and t is the time.

Now from the data , we have 78 argon-40  atoms for every 22 potassium-40 atoms, we can deduce that originally we had 22 + 78 = 100 atoms of potassium-40 so this is our N₀.

When we look at the equation, we see that k is unknown, but we can calculate it from the half-life which is given by the equation:

k =  0.693/ t half-life = 0.693/ 1.3 x 10⁹ yr = 5.33 x 10⁻¹⁰ yr⁻¹

Now we are in position to answer the question.

ln ( 78/100 ) =  - (5.33 x 10⁻¹⁰ yr⁻¹ ) t

- 0.249 = - 5.33 x 10⁻¹⁰ yr⁻¹  t

0.249/ 5.33 x 10⁻¹⁰ yr⁻¹  = t

4.66 x 10^8 yr

8 0
3 years ago
How do I know what to do and can you help me because I really need it I am failing chemistry because it is too hard.
Arlecino [84]

Exothermic:

An Exothermic reaction is a chemical reaction that expels energy in the form of heat/light. Everything a Endothermic does not do. Pretty simple for this one

reactants → products + energy.

For future reference - Exo means release, thermic means heat.

<u>Energy is a Reactant </u>

<u />

<u>_________________________________________________________</u>

Endothermic:

An Endothermic reaction essentially is draining the heat energy from anything its its surroundings. Usually its just heat but can also be salt dissolving it water or ice melting. Another example would be frost on your windshield evaporating.

It is the exact opposite of an Exothermic reaction.

<u>Energy is a Product</u>

4 0
3 years ago
2NaOH + H2SO4 &gt; Na2SO4 + 2H2O
Pepsi [2]

Answer:

To calculate the number we need molar mass.

6 0
3 years ago
Which term represents the stage when the cytoplasm of a cell divides?
taurus [48]

Answer:

Cytokinesis

Explanation:

This is the answer and I am killing time because the minimum is 20 characters...good day

4 0
2 years ago
Other questions:
  • List the three components of traditional cell theory.
    5·2 answers
  • What mass of co2 is produced by the combustion of 1.00 mol of ch4?
    14·1 answer
  • Pentaborane−9 (B5H9) is a colorless, highly reactive liquid that will burst into flames when exposed to oxygen. The reaction is
    11·1 answer
  • Can someone help me
    8·2 answers
  • An empty beaker weighs 39.09 g
    12·1 answer
  • The density of methanol is 0.787 g/ml. What is the mass in grams of 25.0 ml of methanol? Give your answer with the correct unit
    11·1 answer
  • Motivation that is physical and can be touched like a trophy or a medal is:
    13·1 answer
  • A sample of 5.72 g of liquid 1-propanol, C, H, O, is combustod with 43.4 g of oxygen gas, Carbon dioxide and water are
    7·1 answer
  • Can you please help solve and explain the steps for the calculation?
    9·1 answer
  • Proteins have many functions in the cell membrane. Which function is NOT related to a protein?a. transportb. membrane fluidityc.
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!