Calculate the number of moles of potassium in 1.25 x 10 21 atoms K. Strategy Plan STEP

Calculate the number of moles of potassium in 1.25 x 10²¹ atoms K. 

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Strategy Plan STEP 1: What unit is asked for in the answer? STEP 2: What given value is related to the answer? STEP 3: What unit factor(s) should we apply? Because 1 mol K = 6.02 x 1023 atoms K, the two unit factors are 1 mol K/6.02 x 1023 atoms K, and its recip- rocal 6.02 x 1023 atoms K/1 mol K. Unit Analysis Map given value 1.25 x 1021 atoms K Step 1: Step 2: Step 3: unit factor 1 mol K 6.02 x 1023 atoms K 1 mol K 6.02 x 1023 atoms K 1.25 x 1021 atoms K unit in answer = ? mol K mol K or 6.02 x 1023 atoms K 1 mol K