an oil drum weights 11.8kg. when it is filled, octane it weighs 55.32kg. how many molecules of pentane c5h12 exist in this oil drum?

Question: an oil drum weights 11.8kg. when it is filled, pentane it weighs 55.32kg. how many molecules of pentane c5h12 exist in this oil drum?

3.64×10²⁶ molecules

Explanation:

Applying,

n = M/M.M Equation 1

Where n = number of moles of pentane, M = mass of pentane, M.M = reacting mass of pentane

From the question,

Given: M = 55.32-11.8 = 43.52 kg = 43520 g

Constant: M.M of octane (C₅H₁₂) = [(12×5)+(1×12)] = 60+12 = 72 g/mol

Substitute these values into equation 1

n = 43520/72

n = 604.44 moles

Therefore,

number of molecules = n×(6.02×10²³)

number of molecules = 604.44(6.02×10²³)

number of molecules = 3.64×10²⁶ molecules

not clear