David prepares a stock solution of potassium phosphate by adding 46.33 to 250 mL of water. Kim needs a 0.010 M solution of potassium phosphate. To make 150 mL of the diluted solution, Kim would
need
mL of the stock solution.

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What are the similarities of physical and chemical change ?

Given the following at 25c calculate delta hf for hcn (g) at 25c. 2nh3 (g) +3o2 (g) + 2ch4 (g) > 2hcn (g) + 6h2o (g) delta h rxn= -870.8 kj. delta hf=-80.3 kj/mol for nh3 (g), -74.6 kj/mol for ch4, and -241.8 kj/mol for h2o (g)