I would use ounces or grams
This is very unspecific. Density is mass over volume, so I would assume that the temperature of water around it would not effect the mass or volume of the ketchup packet.
pr = packet of ricepb = packet of barley1pr + 1pb = 77.7 2pr +3 pb = 182.741pr = 77.7 - 1pb1pr = (182.74 - 3pb)/277.7 - 1pb = (182.74 - 3pb)/22(77.7 - 1 pb) = 182.74 - 3pb155.4 - 2 pb = 182.74 - 3pb155.4 = 182.74 - pb-27.34 = -pbpb = 27.341pr + 27.34 = 77.71 packet of rice = 50.36 kg
9.6
Mass amounts of sugar are put into sweets.
how would you find the mass of 250 mL of water
You would determine its mass using a mass balance.
Mass of a pony
mohrs method
Different manufacturer's marshmallows will be of different mass so there is no simple answer. If you want the answer you will have to do some work:Get an unopened packet of marshmallows. The net mass should be given on the packet. Suppose that is g grams. Next open the packet and count the number of marshmallows in the packet. Suppose that number is n.Then the mass of each marshmallow, on average, is g/n grams.Having done ALL that hard work, you deserve a marshmallow - or two!
Those are two different things. Mass of a sugar packet . . . gram might be best. Capacity or volume of a sugar packet . . . cubic centimeter might be best.
Density = Mass/Volume
Without knowing either the mass of an object or its density, it would be impossible to find the mass. There would be two variables and only one equation. Thus, one cannot find the mass of an object solely from its volume.