Suppose the Kelvin temperature (as measured by a reliable sensor) of a 9.0000 mol sample of gas in a rigid 5L tank is doubled. It is observed that the pressure increased to 2.1 times its original value. Which of the following statements could explain the observed result. (select all that apply)

No gas escapes and the gas obeys the ideal gas law.

The pressure reading for the final pressure is too high due to instrument malfunction

Some of the gas reacts with impurities in the tank so that the net moles of gas is unchanged

The pressure reading for the final pressure is too low due to instrument malfunction

Some of the gas reacts with impurities in the tank to form additional total moles of gas

Some gas leaks into the tank during heating assuming P is less than external pressure

Some gas escapes the tank during heating assuming P is greater than external pressure

Some of the gas reacts with impurities in the tank to reduce the total moles of gas

Calculate W,Q, Change of U, change of H ,and Change of S for the following two separate processes involved one mole of ideal gas(Cp= 3.5R) with the same initial state at 100kpa and 300k

A) the gas expands adiabatically and mechanical reversibly to 20kpa.

B) the gas expands to the same final state as process a) but it expands irreversibly with an efficiency of 60% compared with the reversible process a)

What are the two main functions of SDS (sodium dodecyl sulfate) in an SDS-PAGE experiment? Explain each function.

Suppose you’re building a vacation cottage up in the Rocky Mountains and you are concerned about the depth at which a new water line should be buried to avoid freezing during the cold winter weather. The soil there is dry and homogenous with a thermal diffusivity of 0.02 ft2/hr and a thermal conductivity of0.48 Btu/ ft hr °F . Suppose the initial temperature is 45 °F everywhere. At t=0, a very strong cold front moves in and the ambient temperature drops to –15 °F, and remains there for 48 hrs. How deep should the water line be so that the soil around the pipe does not fall below 30 °F during this period? Also, what is the heat flux at that depth at t=48 hrs?

An element's atomic number is 31. How many electrons would an atom of this element have?

A pump having the characteristics given in Fig. 14.10 pumps water at 20°C from a reservoir at an elevation of 366 m to a reservoir at an elevation of 450 m through a 36 cm steel pipe. If the pipe is 610 m long, what will be the discharge through the pipe?

Fig. 14.10Performance curves for a typical centrifugal pump; D = 37.1 cm

QUESTION 4 Before determining the ?soltnH of the salts in part B of Experiment 4 it's necessary to calibrate the calorimeter to effective heat capacity of the calorimeter. In order to do this, the neutralisation of hydrochloric acid and sodium hydroxide is used, where the ?H for the reaction is known, along with the specific heat and density of sodium chloride, the product of the reaction. By following the example on page 4-4 of the manual and the steps laid out in the table below determine Ccalorimeter in J K-1. The information that you need is shown in the table below. Value Enthalpy change for one mole ( \Delta H ?H) -58.3 kJ mol-1

Density 1 M NaCl (?) 1.037 g mL-1

Specific heat of 1 M NaCl solution ( C C) 3.90 g-1 K-1

Molarity of sodium hydroxide(aq) and hydrochloric acid(aq) used ( c c) 2 mol L-1

Volume of each of sodium hydroxide(aq) and hydrochloric acid(aq) used ( V V) 50 mL

Average neutralisation temperature rise ( \Delta T ?T) 11.2 °C

Calculation

Moles of H2O produced n (mol) = c (mol L ?1 ) ×V (L)

Enthalpy change for the reaction ? r H (kJ) =n (mol) ×?H (kJ mol ?1 )

Enthalpy change for the corresponding temperature change ? t H (kJ) =?? r H (kJ)

Mass of solution m (g) =V (mL) ×? (g mL ?1 )

Heat capacity of the solution C solution (J K ?1 ) =m (g) ×C (J g ?1 K ?1 )

The heat capacity of the calorimeter ( C calorimeter)

Calculate the pH and the equilibrium concentration of Se^2- in a 8.75×10^-2 M hydroselenic acid solution, H₂Se (aq).

For H₂Se, K_a1 = 1.3×10^-4 and K_a2 = 1.0×10^-11

Calculate the pH and the equilibrium concentrations of HS- and S2- in a 0.0425 M hydrosulfuric acid solution, H2S (aq).

For H2S, Ka1 = 1.0×10-7 and Ka2 = 1.0×10-19

Nicotine is to be extracted with kerosene from a water solution containing 1% nicotine. Water and kerosene are essentially immiscible. The equilibrium of a solute between immiscible solvents is expressed by the distribution coefficient, K, which is the ratio of the solute concentration in the two phases and for the distribution of nicotine between kerosene and water K = 0.9. Calculate the percent extraction of nicotine if 100 kg of feed solution is extracted once with 150 kg solvent.

A) If [M(H20)6]^2+ is red, which of the following complex ions could be yellow in solution?

1) [M(H2O)2Cl4]^2- 2) [M(H2O)4(SCN)2]

B)Which of the following complexes could have the orbital diagram below? (2 unpaired arrows on top row, 1 paired and 2 unpaired on bottom row.)

1) [CoI6]3- 2) [Ni(OH)4]^2- 3) [Fe(CO]6] ^3+

A gas obeys the following equation of state: P(v-b)=RT, where b is constant and has a value of 0.2 m³/Kmole. The heat capacity for the gas can be assumed constant at 40 Kj/Kmol oK.

(a)Calculate change in h and s for State 1(10 bar, 300 K) to State 2( 20 bar, 400 K).

(b) Show Cp is independent of pressure

In a pipe heat exchanger, crude oil on 30 ℃ is used to cool the heavy oil from 180℃ to 120℃.Mass flow of heavy oil is Wh=104kg / h，and crude oil respectively Wc=1.3×104kg/h. Specific heat, respectively is Cph=2.2 kJ/(kg•℃), Cpc=1.9 kJ/(kg•℃). Overall heat transfer coefficient K=120W/(m2•K). Try to calculate the required heat transfer area for parallel flow and countercurrent flow.

Make a list of instructions needed to be able t o extract mineral resources in a person's property.

Air (280 K and atmospheric pressure) enters a 3-m-long rectangular duct (0.15 m by 0.075 m) whose surface temperature is at 400 K. Air mass flow rate is 0.10 kg/s. Find the heat transfer and the outlet temperature. Use the Sieder-Tate equation to solve for the heat transfer coefficient.