Chemistry Answers

Consider a simple first-order reaction AB. If you start with solution of 0.1 mol/L A, it takes 20 seconds to go to a concentration of 0.025 mol/L of A. (a) What is the value of the rate constant for this reaction? (b) Calculate half-life of the reaction. Select one or more: Rate constant = 0.0693 Rate constant = 0.6930 O Rate constant = 6.9310 Rate constant = 0.0250 Rate constant = 0.1250 O Rate constant has another value Half-life = 5 sec O Half-life = 10 sec Half-life = 20 sec Half-life = 40 sec Half-life = 50 sec O Half-life has another value

computethe volume of CO2 produced at 65°C and 2.3 atm when 1.7 g of O2 is used up in the reaction:

C3H8 (s) + 5O2 (g) ——4 H2O(g) + 3H2(g)

compute for the volume of Hydrogen produced at 55°C and 1.5 atm when 3.5 g of AI is used up in the reaction:

2 AI(s)+6HCI (aq) ——2 AICI2 (aq) + 3H2(g)

If 3.6 L of HF decomposed at 65°C and 1.35 atm, what mass of SnF2 will be produced given the reaction:

Sn (s)+2 HF (g)———SnF2 (s)+H2 (g)

If 37 grams of methanol is produced from the reaction of 60 grams of CO and 6 grams of H2.Determine the reagent,excess reagent, percent yield and theoretical yield of reaction

Billie combined 200 grams of N2 and 100 grams H2 to produce 230 grams of ammonia. Determines the limiting reagent, excess reagent, percent yield and theoretical yield of the reaction. show the steps on how you came up with your answer

Boyle's law for the expansion of gas PV=C.At a certain instant,the pressure is 2000 lb./ft², the volume is 8 ft³, and the volume increasing at the rate of 6 ft³/mm. Find the rate of change of the pressure at this time

There is a total of 100 g of Propane (C₃H₈) left in a tank. How much Carbon and Hydrogen in g and % is in 100 g of Propane?

4NH2(g) + 5O2(g) → 4NO(g) + 6H2O(g)

A city when its operation is normal uses a supply of drinking water

containing 15 mg /L of chloride (Cl-), but during periods of high water demand,

mixes with groundwater containing 65 mg/L Cl-. The two waters mix

completely in a 1400 m3 tank and then sent to the distribution system. the

demand for many days has been ~500 m3/d, and all the water has come from

the main supply. So, the demand increases to 700 m3 /d, and the additional

200 m3/d is extracted from the groundwater supply. How long can

continue with this operating strategy before the water entering the

distribution system contains ≥ 20 mg/L Cl-? (Note: chloride is not reactive).