A rigid insulated tank is initially divided into two sections by a partition. One side contains 1.0 kg of saturated-liquid water initially at 6.0 MPa, and the other side is evacuated. The partition is broken, and the fluid expands into the entire container. The total volume is such that the final equilibrium pressure is 3.0 MPa. Determine a) the initial volume of the saturated liquid in liters, b) the total volume of the entire tank in liters,

The following buffer was prepared:

50. mL 2.0 M methylamine (CH3NH2) solution and 50. mL of 2.0 M methylamine hydrochloride (CH3NH3Cl) solution. The Kb for methylamine is 4.4 x 10-4.

What is the pH of the resulting solution after adding 100 ml of 1.0 M HCl to the original buffer solution?

a) 11.12 b) 10.64 c) 12.32 d) 0.48 e) 5.32

(a) What is the total volume of gaseous products, measured at 350°C and 689 torr, when an automobile engine burns 103 g of C8H18 (a typical component of gasoline)? L (b) For part (a), the source of O2 is air, which is about 78.0% N2, 21.0% O2, and 1.0% Ar by volume. Assuming all the O2 reacts, but no N2 or Ar does, what is the total volume of gaseous exhaust?

Plz give detailed solutions:

1. Calculate the pH of a 0.504 M aqueous solution of phenol (a weak acid) (C₆H₅OH, K_a = 1.0×10^-10).

2. Calculate the pH of a 0.0308 M aqueous solution of hydrofluoric acid (HF, K_a = 7.2×10^-4).

3. Calculate the pH of a 0.0703 M aqueous solution of hydrofluoric acid (HF, K_a = 7.2×10^-4).

An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 240 engines and the mean pressure was 5.1 pounds/square inch (psi). Assume the population standard deviation is 1.0. If the valve was designed to produce a mean pressure of 5.2 psi, is there sufficient evidence at the 0.05 level that the valve performs below the specifications?

Step 1 of 6 :  

State the null and alternative hypotheses.

A long solenoid (1500 turns/m) carries a current of 20 mA and has an inside diameter of 4.0 cm.  A long wire carries a current of 2.0 A along the axis of the solenoid.  What is the magnitude of the magnetic field at a point that is inside the solenoid and 1.0 cm from the wire?

a. 78 µ

b.   55 µT

c.    48 µT

d.   68 µT

e.   2.0 µT

3. A stainless steel sphere of thermal conductivity 16 W/m · K with a diameter of 4 cm is exposed to a convective environment of 15 W/m2 · K, 20?C. Heat is generated uniformly in the sphere at a rate of 1.0 MW/m3 . Determine the steady-state temperature of the sphere at its center and its surface. Also determine the heat flux at a radius of 1.5 cm.

1.

a. How is electrode potential related to electrochemical equilibrium?

b. When the standard hydrogen electrode is connected to a half-cell containing magnesium metal immersed in 1.0 M MgSO_4,, which electrode is the anode? Why?

c. When the standard hydrogen electrode is connected to a half-cell containing an inert electrode in contact with liquid bromine and with 1.0M KBr, which electrode is the anode? Why?

Consider the reaction. A(g)⇌2B(g) Find the equilibrium partial pressures of A and B for each of the different values of Kp. Assume that the initial partial pressure of B in each case is 1.0 atm and that the initial partial pressure of A is 0.0 atm. Make any appropriate simplifying assumptions. Find (solve for B and A) (a) Kp= 1.9 (b) Kp= 2.1×10−4 (c) Kp= 1.2×105

Consider the following reaction and associated equilibrium constant:

aA(g)+bB(g)⇌cC(g)

Kc = 4.5

Find the equilibrium concentrations of A, B, and C for a=1, b=1, and c=1. Assume that the initial concentrations of A and B are each 1.0 M and that no product is present at the beginning of the reaction.

Express your answer using two significant figures. Enter your answers separated by commas.