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3 years ago

The following chemical reaction is balanced, but

Chemistry

2 answers:

Ivenika [448]3 years ago

8 0

Answer:

Explanation:

Divide each coefficient by 3:

3Fe(s) + 4H2O(l) ---> Fe3O4(s) + 4H2(g)

GalinKa [24]3 years ago

6 0

3Fe(s) + 4H2O(l) — 1Fe3O4(s) + 4H2(g)

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Which of the following units is not an official SI unit? mole liter kilogram ampere

levacccp [35]

The correct answer is a liter.

The SI or the International System of Units illustrates seven measuring units as a fundamental set from which all the other SI units can be obtained. The SI base units and their physical quantities are the kilogram for mass, the meter for measurement of length, the ampere for electric current, the second for time, the candela for luminous intensity, the Kelvin for temperature, and the mole for the amount of substance.

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4 years ago

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9. Carbon-14 has a half-life of 5,730 years. How many years have passed after 3 half-lives?

ella [17]

Answer:

120 gram sample of a radioactive element, how many grams of that element will be left after 3 half-lives have passed? If you have a 300

Explanation:

Hope this helps!

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3 years ago

A sample of argon gas at stp occupies 56.2 liters. determine the number of moles of argon and the mass in the sample. for the ab

andreev551 [17]

We can use the ideal gas law equation to find the number of moles;
PV = nRT
where P - pressure
V - volume - 56.2 x 10⁻³ m³
n - number of moles
R - universal gas constant - 8.314 Jmol⁻¹K⁻¹
T - temperature
standard temperature is 273 K
and standard pressure - 101 325 Pa
we can rearrange the equation to find the number of moles
$n = \frac{PV}{RT}$
substituting the values in the equation
$n = \frac{101325Pa*56.2 x 10⁻³ m³}{8.314 Jmol⁻¹K⁻¹*273K}$
n = 2.51 mol
molar mass of Ar - 40 g/mol
mass of Ar in the sample - 2.51 mol x 40 g/mol = 100.4 g

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4 years ago

B A. refraction B. Diffraction C. angle of reflection D. angle of incidence

saw5 [17]

Answer:

B. Refraction

Explanation:

The angle of incidence equals the angle of refraction.

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3 years ago

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Explain entropy and its relationship to phase change and number of moles

bulgar [2K]

Answer:

Here's what I get.

Explanation:

What is entropy?

Entropy (S) is often described as a measure of the disorder in a system, but it is really a measure or the number of microstates (W).

A microstate is a specific configuration of the locations of particles and the way that energy is distributed among them.

Entropy is a measure of the degree of the spreading of energy within a system. The more ways that energy can be distributed, the greater the entropy.

Entropy and phase changes

In the solid phase, the particles are in fixed locations and can vibrate slightly about these locations. The number of microstates is relatively small.

If you add energy and convert the solid to a liquid, the particles can slide past each other. The particles have more freedom of motion, so the energy is distributed in more ways. There are more microstates, so S(liquid) > S(solid).

If you add more energy and convert the liquid to a gas, the particles can move in all directions, and the number of microstates (and also S) increases enormously.

Entropy and number of moles

The more particles you have, the more microstates (ways to distribute the energy) there are.

However, the entropy of gaseous particles far outweighs that of those in solids or liquids.

That's why, when you are asked to predict the sign of ΔS for a reaction, all you need do is calculate the change in the number of moles (Δn) of gases.

If the products contain more moles of gases, ΔS > 0. If the products contain fewer moles of gases, ΔS < 0.

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3 years ago