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What is the ph of 0.1 M nh4cl that hydrolyses in 1 dm3 h2o?Kb =1.8 × 10^-5; log7.42=0.87? Factorise x to the power of two, + 10x + 24? The half-life of Yttrium-91 is 59 days. How much of a 4.11 g sample of Yttrium-91 will remain after 354 days? A geosynchronous satellite has a mass of m and a v velocity.what is the total mechanic energy of the satellite?1/2mv^2 or -1/2mv^2? 5,321,046?