How would i solve for 7.50 x 10 squared ml of a 0.000450 m mgso4 solution?

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a pan containing water is placed in a positio n where it is exposed to a 10 mile per hour wind. the pan contains a uniform depth of 1.27 cm of water, is quite wide, and has a length of 2.44 m in the wind direction. the water in the pan is at a constant temperature of 15.5 °c.

b. is the answer hoped i        

im doing test rn im going with 2 but ill give answer if itss wrong,   : )