Help with the biochemistry problems!!! >O<?

1)A solution of cyctochrome c (Mr = 12,400) has a concentration of 6μmol/L. Calculated the amount (in mg) in 5 L.

2) If you have 5 g of haemoglobin (Mr =12,400) and you dissolve it in 500 mL of buffer, calculate the concentration in μM of this haemoglobin solution.