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Calculate the number of moles of B at each time in the table. 0 s mol 40 s mol 80 s mol 120 s mol 160 s mol (b) Calculate the average rate of disappearance of A for each 40 s interval, in units of m
An air stream's humidity is increased by combining it with a stream of water as shown below (hr stands for relative humidity). The water evaporates and increases the moisture content of the air stre
A buffer that contains 0.347 M of a base, B and 0.483 M of its conjugate acid BH+, has a pH of 8.08. What is the pH after 0.00713 mol of HCl are added to 0.442 L of the solution
Determine the molar absorptivity of the acidic form of bromocresol green at 445 nm and at 615 nm. Given: Stock soln of bromoscresol green= 80.0 mg/L Molar Mass= 698.0 g/mol ?(445nm)=A445/[BG]
Calculate the lattice energy (kJ/mol) of the hypothetical ionic compound MX2 from the information given below. IE1+ IE2 (M) = 1,487 kJ/mol M(s)
Calculate the pH of a solution that results from mixing 32.8 mL of 0.157 M dimethylamine ((CH3)2NH) with 44.0 mL of 0.144 M (CH3)2NH2Cl. The Kb value for (CH3)2NH is 5.4 x 10-4
For a particular reaction, ?H° is 55.4 kJ and ?S is 94.1 J/K. Assuming these values change very little with temperature, over what temperature range is the reaction spontaneous in the forward di
What is the concentration of a solution that has 2.79 g of Co(NO3)2 dissolved into enough water to give a total volume 125 mL
How many grams of NaH2PO4 are needed to react with 43.74 mL of 0.285 M NaOH by the following reaction- NaH2PO4(s) + 2 NaOH(aq) --> Na3PO4(aq) + 2 H2O(l)
For the reaction: H2SO4(aq) + 2 KOH(aq) --> K2SO4(aq) + 2 H2O To find the concentration of H2SO4, a 25.00 mL sample was titrated with 0.8752 M KOH. It took 31.79 mL of KOH to reach the endpoint o
A 0.150 M NaCl solution is referred to as a physiological saline solution because it has the same concentration of salts as normal human blood. Calculate the mass of NaCl needed to prepare 275.0 mL
A hockey puck of mass m = 150 g is attached to a string that passes through a hole in the center of a table, what speed must the hockey puck have
For the gas phase decomposition of t-butyl alcohol, (CH3)3COH (CH3)2C=CH2 + H2O the rate constant at 811 K is 1.05E-3 /s and the rate constant at 846 K is 5.64E-3 /s. The activation energy for the g
A large oak tree produces 2.2 metric tons of wood over a 50 year growth lifespan. find the tree's efficiency for converting solar energy to wood heating value
Calculate thePH at the equivalence point in titrating 0.100 M solutions of each of the following with 9.0×10^ 2 M NaOH... calculate the ph for HCLO2
A spy satellite is in circular orbit around Earth. It makes one revolution in 6.02 hours. How high above Earth's surface is the satellite
A 650-N physics student stands on a metric bathroom scale inside an elevator. The elevator (including the student) has a total mass of 875 kg. What is the tension on the elevator cable in both cases
A soccer player kicks a ball from ground level with an initial velocity of 25 m/s at an angle of 30° above the horizontal. What is the highest point in meters that the ball will reach
Suppose you have a 9.00 V battery, a 2 ?F capacitor, and a 7.25 ?F capacitor. Find the charge if the capacitors are connected to the batt
The volume of HI(aq) required to reach the equivalence point : (c) The pH at the half-neutralization point. Enter only numbers in your answer. (d) The pH at the equivalence point
A chemist is trying to determine the amount of CaCO3 in an antacid tablet. She dissolves the tablet in water and titrates it with HCl according to the following reaction
For chemical reactions involving ideal gases, the equilibrium constant K can be expressed either in terms of the concentrations of the gases (in M) or as a function of the partial pressures of the g
A tank of volume 0.5 m^3 contains oxygen at a measure of 1.5 x 10^6 Pa and a temperature at 20 degrees C. How many kilomoles of oxygen are in the tank
Hg(NO3)2(aq) + Na2S(aq) --> HgS(s) + 2 NaNO3(aq) If 50.0 mL of 0.0100 M Hg(NO3)2 is reacted with 20.0 mL of 0.100 M Na2S, how many grams of solid HgS will form