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3 years ago

Question 4 of 10

Chemistry

1 answer:

Luba_88 [7]3 years ago

7 0

Answer:

C. P = nRT

Explanation:

PV = nRT, where n is a number of moles and R is the universal gas constant, R = 8.31 J/mol ⋅ K.

Hope this helps :)

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State the law of conservation of mass

swat32

Answer:

The law of conservation of mass states that mass can neither be created nor destroyed in a chemical reaction. Thus, the amount of matter cannot change.

Explanation:

8 0

4 years ago

How many calcium atoms would be in a 100 g sample of calcium

KengaRu [80]

The number of calcium atoms that would be in a 100 g sample of calcium is 1.505 x 10²⁴ atoms

<u><em>calculation</em></u>

Step 1 ; find the moles of calcium

moles = mass÷ molar mass

from periodic table the molar mass of Ca =40 g/mol

moles is therefore = 100 g÷ 40 g/mol = 2.5 moles

Step 2: use the Avogadro's law constant to determine the number of atoms of Calcium

That is According Avogadro's law 1 mole = 6.02 × 10²³ atoms

2.5 moles=? atoms

{(2.5 moles × 6.02×10²³ atoms) / 1 mole} = 1.505 × 10²⁴ atoms

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3 years ago

Silver can be electroplated at the cathode of an electrolysis cell by the half-reaction. Ag+(aq)+e−→Ag(s) Part A Silver can be e

dmitriy555 [2]

Answer: Mass of silver deposited at the cathode is 37.1g

Explanation: According to Faraday Law of Electrolysis, the mass of substance deposited at the electrode (cathode or anode) is directly proportional to quantity of electricity passed through the electrolyte

Faraday has found that to liberate one gm eq. of substance from an electrolyte, 96500C of electricity is required.

$Ag^+$ +e− ==> Ag(s)

Given that

Current (I) = 8.5A

Time (t) = 65 *60 = 3900s

Quantity of electricity passed = 8.5*3900 =33150C

Molar mass of Ag= 108g

96500C will liberate 108g

33150C will liberate Xg

Xg= (108*33150)/96500

=37.1g

Therefore the mass of Ag deposited at the cathode is 37.1g.

3 0

3 years ago

1. What state of matter has definite volume and definite shape?

den301095 [7]

Answer:

1. A solid has a definite volume and a shape.

2. Liquids take on the shape of their container and will fill the lowest portion of the container, taking on the shape but not the volume.

3. It may take extreme temperature, pressure or energy but all the matter can be changed.

4. Through sublimation, a substance changes from a solid to a gas without even passing through the liquid phase.

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3 years ago

What solid can be formed from a net diagram that has 2 congruent circles and 1 rectangle?

Serggg [28]

Answer: Option (B) is the correct answer.

Explanation:

When two circles are of same same then they are known as congruent circles.

Whereas a rectangle is a kind of parallelogram with all sides equal to $90^{o}$ .

Therefore, when 2 congruent circles and 1 rectangle combines then it results in the formation of a cylinder.

Thus, we can conclude that solid formed when 2 congruent circles and 1 rectangle combines will be a circle.

5 0

3 years ago

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