1.56 ng NH3 to moles
6.98 μg Na2CrO4 to moles
a nano gram is 1 x 10^-9 grams.
multiply the ng by this exponent and then divide by the mol mass to get moles
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a nano gram is 1 x 10^-9 grams.
multiply the ng by this exponent and then divide by the mol mass to get moles