Problem 2:   Helium is a very important element for both industrial and research applications. In its gas form it can be used for welding, and since it has a very low melting point (only 0.95 K under 2.5 MPa) it can be used in liquid form to cool superconducting magnets, such as those found in particle physics experiments. Say we have a cylinder of n = 145 moles of Helium gas at room temperature (T = 20° C). The cylinder has a radius of r = 17.5 cm and a height h = 1.45 m. Part (a)  What pressure (in kPa) is the helium gas under? P = ______ Part (b)  Helium is usually kept in the highest pressure gas cylinders, which can typically withstand at least 500 atm of pressure. Would the tank in part (a) be able to maintain its structural integrity?   Part (c)  In principle, these tanks could fail if the temperature of the Helium started rising - if they were stored in a hot environment, for instance. To determine how much of a danger this is, calculate the temperature (in C) the Helium gas…

Helium is a very important element for both industrial and research applications. In its gas form it can be used for welding, and since it has a very low melting point (only 0.95 K under 2.5 MPa) it can be used in liquid form to cool superconducting magnets, such as those found in particle physics experiments. Say we have a cylinder of n = 105 moles of Helium gas at room temperature (T= 20° C). The cylinder has a radius of r = 16.5 cm and a height h = 1.31 m. What pressure (in kPa) is the helium gas under? P = Helium is usually kept in the highest pressure gas cylinders, which can typically withstand at least 500 atm of pressure. Would the tank in part (a) be able to maintain its structural integrity? In principle, these tanks could fail if the temperature of the Helium started rising - if they were stored in a hot environment, for instance. To determine how much of a danger this is, calculate the temperature (in C) the Helium gas would have to be to make the tank start to crack. Tmax

The average translational kinetic energy of O2 molecules (relative molar mass 32) at a particular temperature is 0.048eV. The translational kinetic energy of N2 molecules (relative molar mass) in eV at the same temperature is? a) 0.0015 b) 0.003 c) 0.048 d) 0.768

Helium is a very important element for both industrial and research applications. In its gas form it can be used for welding, and since it has a very low melting point (only 0.95 K under 2.5 MPa) it can be used in liquid form to cool superconducting magnets, such as those found in particle physics experiments. Say we have a cylinder of n = 85 moles of Helium gas at room temperature (T = 20° C). The cylinder has a radius of r = 12.5 cm and a height h = 1.51 m.   A: What pressure (in kPa) is the helium gas under? B: In principle, these tanks could fail if the temperature of the Helium started rising - if they were stored in a hot environment, for instance. To determine how much of a danger this is, calculate the temperature (in C) the Helium gas would have to be to make the tank start to crack.

Suppose there are 200 cm' of oxygen at a temperature of 0°C and a pressure of 1.50 • 10° Pa. How many moles of Oxygen are there? n = sin() cos() tan() 7 8 9 HOME

Compare temperatures TA and Tc. p (atm) 5 4 3 2 1 0 1 ● TA TC TA = TC not enough information → V (m³)

QUESTION 3 The temperature at state A is 20°C, that is 293 K, what is the temperature at state B? p (atm) 5 4 3 2 1 0 D 1 2 3 4 B 586 K not enough information 40°C 146.5 K 293 K 10°C I 5 → V (m³)

Car manufacturers are developing engines that use H2 asfuel. In Iceland, Sweden, and other parts of Scandinavia, wherehydroelectric plants produce inexpensive electric power, the H2 can be made industrially by the electrolysis of water(a) How many coulombs are needed to produce 3.5x10^6L of H2 gas at 12.0 atm and 25°C? (Assume the ideal gas law applies.)(b) If the coulombs are supplied at 1.44 V, how many joules areproduced?(c) If the combustion of oil yields 4.0x10^4kJ/kg, what mass ofoil must be burned to yield the number of joules in part (b)?

1:59 Untitled Question 3 points A tank has a volume of 0.5 m' and contains 4 mol of hellium gas at 25°C The total translational kinetic energy of the gas molecules and v of the helium atoms, if m6.64x107 kg /molecule is: O (6.17x10-21 J, 1363 m/s) O (1.5x104 J, 1113 m/s) O None of the above O (1.5x10*4 J. 1363 m/s) O (1.55x10^4 J, 1390 m/s) Submit Page 1 of 1