# n mole of PCl3 and n mole of Cl2 are allowed to react a constant temperature T under a total pressure P as PCl3 (g) + Cl2 (g) <---> PCl5 (g) If Y mole of PCl5 are formed at equilibrium , find Kp? please explain every step... thankyou

Aman Bansal
592 Points
11 years ago

Dear Siddharth,

12.123 has 5 significant figures and 3 decimal places. 12.0123 has 6 significant and 4 decimal places. It is incorrect to take numbers apart and refer to individual portions as having their own significant figures. Here is a good example: The log of a product is equal to the sum of the logs of each multiplier: log(2.73 ×10^–5) = log(2.73) + log(10^–5) log(2.73) = 0.436: the answer has three significant figures, reflecting the possible error in the last digit of 2.73. log(10^–5) = –5.000000000...: the answer has an infinite number of significant digits because 10^–5 is an exact number and has no error. Then, log(2.73×10^–5) = log(2.73) + log(10^–5) = 0.436 + (–5.00000000...) requires that we use the rules for significant digits for sums, i.e., we can only add to the same decimal place as the value with the least significance. In this case, that is the third decimal place from 0.436, so 0.436 + (–5.000) = –4.564 or log(2.73 ×10^–5) = –4.564

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Aman Bansal