The specific heats at constant pressure of some common gases are provided as a thirdorder polynomial: �;<<< = � + �� +
��C + ��E, with units J/(mol K). For methane (CH4) the coefficients are � = 19.89, � = 5.024 × 10NC, � = 1.269 × 10NO, � = −11.01 × 10NQ. At a production facility, the gas in a 50-liter tank is compressed to 3,600 psi (gage) during which time the temperature rises to 200°F. How much heat in J is given off as the gas cools to room temperature? Suppose the compressed gas is helium, how much heat would be given off in this case?
1 answer:
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Following are the possible isomers of secondary alcohol and ketones for six carbon molecules. In order to distinguish between sec. alcohol and ketone we can simply treat the unknown compound with acidified Potassium Dichromate (VI) in the presence of acid. If with treatment with unknown compound the colour of K2Cr2O7 (potassium dichromate VI) changes from orange to green then it is confirmed that the unknown compound is sec. alcohol, or if no change in colour is detected then ketone is confirmed. This is because ketone can not be further oxidized while, sec. alcohol can be oxidized to ketones as shown below,
Answer: 0.174 g
Explanation:
First of all understand that charge on an atom like here 2+ will not vary molar mass. because ions are formed by loss or gain of electrons and electrons do not contribute to the mass of an atom or ion. so losing or gaining electron doesnt create any difference.
molar mass of Fe, i.e. mass of 1 mole of Fe is 56 g. So, mass of 1 mole of Fe2+ will also be 56 g.
given is 0.003109 moles of Fe2+,
Use maths,
1 mole of Fe2+ weighs 56 g
So, 0.003109 moles will weigh = (56 g / 1 mol ) x 0.003109 = 0.174 g.
