1) 2) What pressure (relative to its original pressure) would be required to red
ID: 854040 • Letter: 1
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1)
2)
What pressure (relative to its original pressure) would be required to reduce the volume of a gas to one third its original volume? Use the volume and pressure with the ideal gas equation to estimate the total number of moles of molecules and atoms in the air sample. Assume that the temperature of the gas during the experiment was 22.3 degree C. Be careful to use correct units in the calculation. How do chemical reactions transfer heat? Discuss what happens when 25.0 mL of 1.0 M NaOH (aq) is mixed with 20.0 ml_ of 1.0 M HCI (aq). Explain (in words and/or pictures) what you think the molecules, atoms, and/or ions are doing before, during, and after the reaction. Molecules, atoms, and ions can be represented with symbols; if you use symbols, be sure to include a key. Predict whether the reaction is endothermic or exothermic.Explanation / Answer
1) a)for the temperature to remain same , The pressure needs to Triple that is
if initial Pressure was P then the final pressure will be 3P for the volume to reduce to 1/3rd the initital volume.
b) Assuming standard Pressure and Volume conditions ,
P= 101.325 kPa , V= 22.4 L , T = 273+ 22.3 = 295.3 K
n = PV/RT = 101.325*22.4 / (8.314*295.3) = 0.924 moles
2) a. 25*1 - 25 mmoles of NaOH , 20*1=20 mmoles of HCl ,
gives 20 mmoles of NaCl and 20 mmoles of H20 and 5 mmoles of OH- .
b) the above reaction is an exothermic reaction . As Heat is evolved in the process.
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