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Annette [7]
3 years ago
14

One mole of calcium ions has the same number of representative particles as which of the following? one mole of calcium nuclei o

ne mole of calcium atoms 6.02 x 1023 calcium ions All of these are correct.
Chemistry
1 answer:
Kruka [31]3 years ago
3 0
One mole is always the same number: 6.02 * 10^ 23.

So, one mole of cars = 6.02 * 10 ^23 cars; one mole of pencils = 6.02 * 10^23 pencils; one mole of atoms = 6.02 * 10^23 atoms; one mole of molecules = 6.02 * 10^23 molecules.

So, all the options are correct: one mole of calcium ions has 6.02 * 10^23 representative particles, such as one mole of calcium nuclei and one of calcium atoms.
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The molar mass of C2H6O2
KengaRu [80]

Answer:

62.07 g/mol

Explanation:

3 0
2 years ago
How many moles of water are created if 3 moles of hydrogen react completely with excess oxygen?
Alenkinab [10]

Answer:

3.0 moles.

Explanation:

  • It is a stichiometry problem.
  • The chemical reaction of reacting hydrogen with oxygen to produce water is:

<em>H₂ + 1/2 O₂ → H₂O.</em>

  • It is clear that <em><u>1.0 mole of H₂</u></em> reacts with 0.5 mole of O₂ to produce <u><em>1.0 mole of  water</em></u>.
  • The ratio of the reacting hydrogen to the produced water is 1:1.

∴ The number of moles of water created from reacting 3.0 moles of hydrogen completely with excess oxygen = 3.0 moles.

4 0
3 years ago
At constant temperature the pressure on a 6.0 L sample of a gas is reduced from 2.0 atm to 1.0 atm. What is the new volume of th
kotegsom [21]
P1V1=P2V2, so P1V1/P2=V2.
2atm x 6.0 L/1.0 atm = 12.0 L
The new volume would be 12.0 Liters
4 0
3 years ago
Read 2 more answers
One of your chores is to mow the lawn. The lawnmower runs on gasoline. The gasoline
trasher [3.6K]

B

Explanation:

Burning is a chemical change and cutting grass is a physical change

7 0
3 years ago
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An endergonic reaction with a Δh and Δs can be changed into an exergonic reaction.
zheka24 [161]

Full question:

This question is incomplete, here it is completed:

An endergonic reaction with a ______ ∆H and a ______ ∆S can be changed into an exergonic reaction by decreasing the temperature.

Option A: negative, positive

Option B: negative, negative

Option C: positive, positive

Option D: positive, negative

Answer:

Option B: negative, negative

Explanation:

The change in free energy (ΔG) of a system for a constant-temperature process is

ΔG = ΔH - TΔS

free energy is the energy available to do work. Thus, if a particular reaction is accompanied by a release of usable energy (that is, <u>ΔG is negative</u><u>), it is said to be</u><u> exergonic</u>. On the other hand, if a reaction consumes energy (that is, <u>ΔG is positive</u><u>), it is said to be </u><u>endergonic</u>.

Looking at the equation, we can see that if ΔH is negative and ΔS is negative, then ΔG will be negative only when TΔS  is smaller in magnitude than ΔH. This condition is met when T is small.

ΔG = ΔH - TΔS

           -        -

This means that the reaction proceeds spontaneously at low temperatures. At high temperatures, the reverse reaction becomes spontaneous. An example of that would be the following reaction:

NH₃(g) + HCl(g) → NH₄Cl(s)

4 0
3 years ago
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