The recommended daily allowance (RDA) of the trace metal magnesium is 410 mg/day for males. Express this quantity in μg/day.

The recommended daily allowance (RDA) of the trace  metal magnesium for males = 410 mg/day Now we know that 1 mg = 1000 μg So 410 mg/day = (410 * 1000) μg/day                    = 410000 μg/day So the recommended daily allowance (RDA) of the trace metal magnesium for males = 410000 μg/day