It should weigh around 20 pounds. This can vary a bit though because the bags have varying levels of moisture can change the weight bag by bag.
1 cubic metre = 1000 litres.
That depends how big each individual bag is.
10 pounds
The density of steel alloy varies depending on its constituents and ranges between 7,750 and 8,050 kg/cu mtr (4.48 and 4.65 oz/cu in).It will therefore weigh between 645.12 and 669.6 ounces.