Hydrocarbon weighing 112g is burned in air to produce 328.5 g of carbon dioxide what percent mass of carbon in the hydrocarbon

Explanation:

As per the law of conservation of mass all the mass of carbon present in the hydrocarbon weighing 112 g is present in the 328.5 g of carbon dioxide produced when the hydrocarbon was burned in air.

1) Calculate the mass of carbon in 328.5 g of carbon dioxide:

            x / 328.5 g CO₂ = 12.011 g C / 44.009 g/mol ⇒ x = 86.65 g C

2) Calculate the percent mass of carbon:

            = (89.65 / 112) × 100 = 80.04%

Round to three signifcant figures: 80.0%.

question: ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

answer: 8 m/s he needs to run twice as fast to keep up so he has some work to do

explanation:   if the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

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(jacemorris04)