fluid mechanics

3 questions, 1 attached and two are posted here.

Please help and show work.

1.38 The specific weight of an unknown liquid is 12 400 N/m3.What mass of the liquid is contained in a volume of 500 cm3? Use:

(a) The standard value of gravity.

(b) The minimum value of gravity on the earth.

(c) The maximum value of gravity on the earth.

1.36 Use Eq. 1.5.3 to determine the density and specific gravity of water at 70°C.What is the error in the calculation for density? Use Table B.1.