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3 years ago

How many molecules are in 4 moles of He?

Chemistry

1 answer:

PIT_PIT [208]3 years ago

4 0

Answer:

⇒ n = 2.4088 × 10²⁴

- So, the no of atoms in 4 moles of helium is 2.4088 × 10²⁴.

Explanation:

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Is cloth a good insulator

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3 years ago

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what would be the final volume when 2.20 M solution is made from 25.0 mL of a 12.0 M solution? plzz show work

cupoosta [38]

Answer:

136.36 mL

Explanation:

Here we have to use the dilution formula

From C1V1= C2V2

Where;

C1= initial concentration of the solution= 12.0 M

C2= final concentration of the solution= 2.20 M

V1 = initial volume of the solution= 25.0 ml

V2= final volume of the solution= ?????

Then recall;

C1V1=C2V2

V2 = C1V1/C2

Substituting values from the parameters given;

V2= 12.0 × 25.0 / 2.20

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3 years ago

The maximum amount of product that can be produced from a given amount of reactant is known as ______________________.

vova2212 [387]

Answer:

The answer to your question is Theoretical yield

Explanation:

Theoretical yield is the quantity of a product obtain considering that all the reactants will be converted into products. The theoretical yield considers that the reaction is 100% effective, but this is not true most of the chemical reactions have a yield of 80 % or lower.

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3 years ago

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Amino axit X có công thức H2NCxHy(COOH)2. Cho 0,1 mol X vào 0,2 lít dung dịch H2SO4 0,5M, thu được dung dịch Y. Cho Y phản ứng v

Taya2010 [7]

Answer:

nH2SO4 = 0,1 mol

Đặt nNaOH = a; nKOH = 3a (mol)

Quy đổi phản ứng thành: {X, H2SO4} + {NaOH, KOH} → Muối + H2O

Ta có: nH+ = nOH- → 2nX + 2nH2SO4 = nNaOH + nKOH

→ 2.0,1 + 2.0,1 = a + 3a → a = 0,1

→ nH2O = nH+ = nOH- = 0,4 mol

BTKL: mX + mH2SO4 + mNaOH + mKOH = m muối + mH2O

→ mX + 0,1.98 + 0,1.40 + 0,3.56 = 36,7 + 0,4.18 → mX = 13,3 gam

→ MX = 13,3/0,1 = 133

→ %mN = (14/133).100% ≈ 10,526%

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2 years ago

The molecules in a sample of oxygen gas are in constant motion. What does an increase in temperature indicate about the movement

Basile [38]

Answer:

An increase in temperature indicates that the molecules of gas speed up.

Explanation:

The molecular kinetic theory states that the average kinetic energy of gas particles (molecules) is proportional to the absolute (Kelvin) temperature of the gas, and all gases at the same temperature have the same average kinetic energy.

Therefore, as the temperature increases so the kinetic energy increases.

It is also known that the kinetic energy is proportional to the squared speed of the particles, therefore the higher the kinetic energy the average speed of the molecules:

higher temperature → higher kinetic energy → higher average speed

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3 years ago

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How many molecules are in 4 moles of He?​

How many molecules are in 4 moles of He?