If the gas is Xe, how many grams are there of the gas, [Xe = 131.29g/mol] 11.) M
ID: 976391 • Letter: I
Question
If the gas is Xe, how many grams are there of the gas, [Xe = 131.29g/mol] 11.) Methane gas (CH_4) occupies a container with a pressure of 99,780 Pa and a temperature of 670 degreeC. What is the gases density? [R = 0.082 (Lmiddotatm/molmidotK)][1 atm = 101,325 Pa][CH_4 = 16.04 g/mol] 12.) A sample of 2.91 moles of iron (Fe) with a C_Ft = 0.450 J/g degreeC is cooled from 238.2 degreeC to 113 degreeC. What is the amount of heal released by the sample? [Fe = 55.85 g/mol] 13.) A pure sample of 1.48 moles of tin has a temperature of 213degreeC is placed in a water bath that is insulated. If the water bath contains 225 moles of water and has an initial temperature of 18 degreeC what is the final temperature of the tin once thermal equilibrium has been reached? [C_H2O = 4.186 J/g degreeC ] [C_Sa = 0.21 J/g degreeC)[Sa = 118.71 g/mol][H_2O = 18.016g/mol]Explanation / Answer
12) Molar mass of Fe = 55.85 g/mol
Mass of Fe = number of moles * molar mass
=> 2.91 mol * 55.85 g/mol
=> 162.5235 gms
Heat Released by Sample = mass * specific heat capacity of Fe * change in temperature
=> 162.5235 * 0.450 * (238.2-113)
=> 9156.57 J
13)
Let the final temperature be Tf
Heat released by Tin = Heat absorbed by water
1.48 * 118.71 * 0.21 * (213-T) = 225 * 18.016 * 4.186 * (T-18)
213 - T = 459.90T - 8278.35
460.90T = 8491.35
T = 8491.35/460.90 = 18.423C