CHEMISTRY HIGH SCHOOL

What mass of oxygen gas contains the samenumber of moles as 56g of sulphur?
(Relative atomic mass: S=32,0=16)
(A) 0.56 g
B) 5.6 g
(C) 56 g
C) 560g

Answers

Answer 1
Answer:

The mass of oxygen gas contains the same number of moles as 56g of sulphur is 56g

Calculation,

Number of moles of sulphur = given mass/ molar mass of sulphur

Number of moles of sulphur = 56/ 32 moles

Number of moles of sulphur = 1.75 moles

According to question,

Number of moles of sulphur = Number of moles of oxygen(O2)

So, Let mass of oxygen be X.

Number of moles of oxygen = X/16×2 = 1.75 moles

Mass of oxygen (X) = 1.75×16×2 grams

Mass of oxygen (X) = 56 grams

What is moles ?

The 6.022×1023 of chemical species like an electrons, molecules atoms, ions etc is called moles

To learn more about moles here.

brainly.com/question/26416088

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Answer 2
Answer:

Answer:

C. 56 g

Explanation:

56 g S (1 mol S/ 32 g) = 1.75 mol S

1.75 mol O2 (32 g/ 1 mol O) = 56 g O2

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A 220.0-mL sample of helium gas is in a cylinder with a movable piston at 105 kPa and 275 K. The piston is pushed in until the sample has a volume of 95.0 mL. The new temperature of the gas is 310. K. What is the new pressure of the sample?(1) 5l.1 kPa(2) 216 kPa(3) 243 kPa(4) 274 kPa

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4. This problem is really simple if you realize that you can use the combined gas law:

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The new pressure of the sample of helium gas in a cylinder with a movable piston is 274 kPa.

Option 4)274 kPa is the correct answer.

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Combinedgas law put together both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that "the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.

It is expressed as;

P₁V₁/T₁ = P₂V₂/T₂

Given the data in the question;

  • Initial volume V₁ = 220.0mL = 0.22L
  • Initial pressure P₁ = 105kPa = 1.03627atm
  • Initial temperature T₁ = 275K
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To calculate the new temperature of the gas, we substitute our given values into the equation above.

P₁V₁/T₁ = P₂V₂/T₂

P₁V₁T₂ = P₂V₂T₁

P₂ = (P₁V₁T₂) / V₂T₁

P₂ = ( 1.03627atm × 0.22L × 310K ) / ( 0.095L × 275K )

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Option 4)274 kPa is the correct answer.

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