#### • Class 11 Physics Demo

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#### • empirical formula methane

From Wikipedia

Methane

Methane is a chemical compound with the chemical formula CH|4. It is the simplest alkane, and the principal component of natural gas. Methane's bond angles are 109.5 degrees. Burning methane in the presence of oxygen produces carbon dioxide and water. The relative abundance of methane

Question:i believe i have correctly correctly balanced the combustion equation. CH4 + 2O2 -----> CO2 + 2H2O using formula n = m / Mm the no. of moles of CH4 = 0.093505 is this equal to the number of moles of the CO2 or is further working required?

Answers:Yes, as can be seen from the balanced reaction, there is 1 mole of CO2 produced for every 1 mole of CH4 reacted. Thus moles of CH4 = moles of CO2 = 0.09375 moles CO2. Since you need grams of CO2, simply multiply by molar mass of CO2 (or about 44 g/mol). grams of CO2 = 0.09375 mol x 44g/mol = 4.125 g CO2

Question:A furnace that provides heat by buring methane gas (CH) must have the correct mixture of air and fuel to operate effeciently. What is the mole ratio of air to methane gas in the combustion of methane? Hint Air is 20% oxygen.

Answers:Methane = CH4 CH4 + 2 O2 --> CO2 + 2H2O molar ratio of O2 to CH4 = 2 to 1 molar ratio of air to CH4 = 10 to 1

Question:How many grams of methane gas must be combusted to heat 1.15kg of water from 23.0 to 88.0 , assuming as a product and 100% efficiency in heat transfer?

Answers:I advise you to make it your self follow the following steps 1- right the equation as of the reaction as follow CH4 + O2-----CO2 + 2H2O 2- calculate the energy needed to break the following bonds. a-4 bonds of C-H b- Calculate the energy needed to break 2of O=O bond Add a+b this will be the energy reactants. 3- calculate the energy produced on formation of the products a1- calculate the energy needed to form 2C=O b2- calculate the energy needed to form 4 H-O add a1 +b2= that will be the energy produced 4- calculate the reaction energy using the following Energy of the reaction = energy of product- energy of reactants 5- calculate the energy needed to heat 1.15kg of water from 230 to 88.0

Question:

Answers:4 CH4 + 3O2 >> 2C2H2+ 6 H2O