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Could the formula mass of a compound ever contain a decimal point?
Yes it could.
How many 7 kg are there in m in two decimal places?
Kg is a unit of mass, while m is a unit of distance, so the conversion you request is not possible.
How do the decimal places on the atomic masses of elements realate to isotopes?
The atomic mass of an element is the weighted average of masses of the isotopes of the element, weighted in proportion to their abundance.
Mass Times Volume is a formula for what?
Mass times volume isn't a formula for anything. You may be confused with mass divided by volume, which is the formula for density.
What is the formula to figure out the weighted average of something?
Lets say there are 3 isotopes of an element. A is 25% and has a mass of 24, B is 40% and has a mass of 25, and C is 35% and has a mass of 26. Multiply the mass by the percentage in decimal form and add all together. (.25 x 24) + (.40 x 25) + (.35 x 26) = weighted average. If there are more then continue (percent in decimal form x mass) and keep adding.
