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a mixture of methane and air is capable of being ignited only if the mole precent of methane is 5% or 15% . a mixture contaning 9.0 mole precent % of methane in air flowing at a rate 700. kg/h is to be diluted with pure air to reduce the methane concentration to the lower flammability limit . calculate the rquire flow rate of air in mol/h and the precent by mass of oxygen in the products gas. (note air may be taking to consist of 21 mole % O2 and 79 % N2 and to have an average molecular weight 29.0 .
Europium (Europium is a chemical element with the symbol Eu and atomic number 63 )crystallizes in a body-centered cubic lattice compute the unitcell edge length in pm if The density of Eu is 5.26 g/cm3..
A flask contains 0.330 mol of liquid bromine, Br2. Determine the number of bromine molecules present in the flask.
The density of tungsten is 19.35 g/cm3. A sample of tungsten is placed in a graduated cylinder containing 30.0 mL of water and the water level rises to 34.0 mL. What is the mass in grams of the sample of tungsten?
An experiment shows that a 115 mL gas sample has a mass of 0.169 g at a pressure of 699 mmHg and a temperature of 31C.What is the molar mass of the gas?
If 329 g water at 65.7°C loses 9730 J of heat, what is the final temperature of the water?
How much energy in kilojoules is required to change 47.6grams of ice at 0 degrees of celcius water at the same tempature
Al(OH)4-(aq) → AlO2-(aq) + 2 H2O(l) What is the oxidizing agent? What is the reducing agent? What is the substance being oxidized?
How many grams of iron metal do you expect to be produced when 265 grams of an 84.5 percent by mass iron (II) nitrate solution reacts with excess aluminum metal?
Calculate the equilibrium constant for the reaction - flask at a certain temperature according to the reaction
69.7 grams of a solute with a molecular mass of 2790 grams are dissolved in enough water to make 1.00 dm(3) of solution at 20 degrees C. What is the osmotic pressure of the solution? express your answer in kPa
How many moles of Fe(NO3)3 are required to prepare a 354.6 mL solution that is 9.737 moles/liter of NO3-?
How many milliliters of 0.105 M HCl are needed to titrate 50.0 mL of a solution that contains 1.25 g of NaOH per liter?
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