Pure ethylenediamine(ED), H2NCH2CH2NH2 , is a liquid with a density of 0.896 g/ml. What mass of this compound would be needed to prepare 1.00 liter of a 0.030 M solution

Can someone me with these questions plz.

Amedication is given at a dosage of 3.000 mg of medication per kg of body weight. if 0.1500 g of medication is given, then what was the patient's weight in pounds (lbs)? there are 453.59g in 1 lb.

6) (a) calculate the absorbance of the solution if its concentration is 0.0278 m and its molar extinction coefficient is 35.9 l/(mol cm). the depth of the cell is 5 mm. (b) what is the %t? (7) calculate the absorbance of the solution if the transmitted light intensity is 70% of the initial light beam intensity