3. A forensic scientist analyzes a sample for sodium arsenate, Na2AsO4(s), a source of arsenic. Calculate the percent arsenic in sodium arsenate.

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Ans. : frostbite is when exposure to cold temperatures causes freezing to the skin or other tissues. it most commonly affects the hands, feet, and face. the longer areas are exposed to cold, typically the worse the frostbite. the water temperature used for rewarming a frostbitten part should be : (102 -105) f degrees.