Question

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

Answer 1

Answer:

The answer is option C

Explanation:

To calculate the mass of oxygen gas we must first find the number of moles of sulphur

Molar mass = number of moles (n) / mass

n = mass / Molar mass

From the question

Molar mass (M) of Sulphur = 32g/mol

mass = 56g

n( Sulphur) = 56/32 = 1.75mol

Since the moles of oxygen and sulphur are the same

M(O2) = 16 × 2 = 32g/mol

Mass of oxygen = molar mass × moles

= 32 × 1.75

= 56g

Hope this helps you