What percent yield is obtained if 310 g of Au produces 340 g of NaAu(CN)2 when 4Au + 8NaCN + 2H2O + O2 --> 4NaAu(CN)2 + 4NaOH

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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.

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