The percent of sodium (by mass) in the hydrate

1. Write the formula for the given compound.

2. Calculate the molar mass of each part of the compound separately. Also, the number in front of the water molecule must be distributed and multiplied by the subscript of both the hydrogen and the oxygen in the water molecule.

3. Add the totals for each part together to find the molecular formula mass.

4. Divide each part’s mass by the molecular formula mass.

5. Multiply each result by 100 in order to get a percentage.

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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.