1g sample of tetrafluoromethane (cf) contains 90 g of carbon. what is the mass percent or nuorine in the compound?

The question is typed wrong.

The correct question should be

171 g sample of tetrafluoromethane (CF4) contains 90 g of carbon. What is the mass percent of fluorine in the compound?

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47.37%

Explanation: -

Mass of Carbon = 90 g

Total mass of tetrafluoromethane =171g

Mass of fluorine = Total mass of tetrafluoromethane – mass of carbon

= 171 g – 90 g

= 81 g

Mass percentage of Fluorine = ( Mass of fluorine / Total mass of tetrafluoromethane ) x 100

= (81 / 171) x 100

=47.37%

explanation: no but i do not usually comment

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.