An instrumental for the analysis of trace hydrocarbons in air, or in the products of combustion uses a flame ionization detector. The flame in this device is fueled by mixture of 40% (vol.) hydrogen and 60%(vol)helium. The fuel mixture is contrained in a 42.8-liter tank at 1500psig and 298K. The atmospheric pressure is 1000kPa.  What is the partial pressure of each constituent in the tank and the total mass of the mixture. Assume Ideal gas behavior for the mixture.

The concentration of NO₂ in the air at STP is observed as 0.45 ppm. At STP, 1 mole of any gas occupies 22.4 L. The molecular weight of NO2 is 46 g/mol. The concentration of NO₂(in µg/m³, rounded off to one decimal place) is.

Particle emissions in a house. The power goes out in your apartment (volume = 150 m3) at night, so you decide to light a few candles. These candles have a combined particle emission rate of E = 2.0 mg/h. Your apartment has a ventilation flow of 1.5 m3/min and the particles have a first order loss rate (due to deposition, which acts similar to a reaction) of 0.25 h−1, so: Write the differential equation and define the source and loss terms. Calculate the values for the source and loss terms and rewrite the differential equation with these values. What is the steady state particle concentration in your house (in μg/m3)? Write the time-varying solution to this problem and calculate the particle concentration after 1 hour of candle-burning (in μg/m3). If after 1 h of lighting the candles the power returns and the candles are all immediately put out, what will be the particle concentration 3 h after first lighting the candles?

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Determine the concentration of hydrogen ion and the hydroxide ion (in mg/L) of a solution that has a pH of 9.1

A piston cylinder device contains 5 kg hydrogen gas. Heat is transferred to the hydrogen as the temperature increases by 23.28 F. What is the boundary work done during this process kW.

The enthalpy of combustion of benzoic acid (C6 H5 COOH) is commonly used as the standard for  calibrating constant-volume bomb calorimeters;  its value has been accurately determined to be  −3226.7 kJ/mol. When 1.9862 g of benzoic acid are  burned in a calorimeter, the temperature rises from  21.84°C to 25.67°C. What is the heat capacity of the  bomb? (Assume that the quantity of water surrounding  the bomb is exactly 2000 g.)

What is the minimum amount of ice at 0°C that must be added to the contents of a can of diet cola (340mL) to cool it down from 20.5°C to 0°C? Assume that the specific heat and density of the diet cola are the same as for water and that no heat is gained or lost to the surroundings. The latent heat of fusion of ice is 333 J/g.

4: An important reaction in muscular activity is the oxidation of lactic to pyruvic acid. Calculate AH° for the reaction given that the AH° of combustion (see Problem 1) is -279 kcal/mole for pyruvic acid and -326 kcal/mole for lactic acid (lactic acid CH, CНОНlСООн; рүruvic acid — CH,COCOOH).

A balloon filled with hydrogen gas has a volume of 5200 cubic centimeters at 44 degrees Celsius and 9.0 x 104 Pa. What volume (in liters) does the H2 occupy at standard temperature and pressure(STP).