First of all we need to define the cross sectional area of the rod. If it is a cylinder rod we would use pi * r^2, Do this metrically to make things easy (metres). next we times that by a ft (in metric it is 30cm) so do: cross sectional area * 0.3m. this is the volume of the steel per foot. now find out the weight per cubic cm (density) and multiply them. To find mass of a material you need to weigh it, or times its relative Atomic Mass by the number of moles. You'll have to find the density of your steel as you havn't specified what kind and there isn't a 'pure' steel as its an alloy.
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The weight of 1 foot of steel rod would depend on the diameter of the rod.
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The volume is 150.152 cm3. The density of steel varies according to the constituents but is normally between 7.75 and 8.05 grams per cm3. Using g = 9.8, this range would give a weight in the range 11.4-11.8 Newtons.
There is no way to determine weight of random dimensions. The weight of 3.5 meters of thread is going to be vastly different than 3.5 meters of steel rod.
You need the length of the rod to compute the weight. To do so, you can calculate the volume of the rod, which would be length*Pi*22 multiplied by the density of MS, which is 7.86 g/cm3, or simply 15.72(Pi)*length of the rod Mildsteel rod 40mm dia. = 9.85 kg per metre. I think that is what you asked.