multiply by 9.8
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Multiply the mass fraction by 100.
Weight=mass x acceleration due to gravity = mass(lbs) x 32.1 (ft/s^2) So, mass(lbs) = (weight)/(32.1)
"Pound" is a unit of force. "Kg" is a unit of mass. They don't convert directly. On Earth, 70 pounds is the weight of 31.751 kg of mass. (rounded) On the moon, 70 pounds is the weight of 191.858 kg of mass. (rounded) In other places, 70 pounds is the weight of different amounts of mass.
You cannot. Volume and weight are two different characteristics and, according to basic dimensional analysis, conversion from one to the other is not valid. If you had the density of the substance, you would be able to convert the volume to mass. But mass is not the same as weight. You would then need information about the strength of gravitational attraction at the location to convert the mass into weight.
You can't convert the two. One is measurement of weight, and the other is a measurement of mass.