236.58824 grams
Since oil will float on top of water, we can assume that the weight (or mass) of water is greater than that of oil.
The answer will depend on the size of the cup and, therefore, the quantity of water in it!
It remains 200 mg. Placing it anywhere does not change its mass
Too vague a question. If you mean, does sealing the cup change the mass, then no it does not change the mass of the water, though the sealing material would add its own mass to the total.
measuring cup
0.6
about 100
They are virtually the same
3.6
243 grams
density is mass over volume. if the mass increases then the volume increases proportionately.
Oil is less dense than water. Therefore, equal volumes of water and oil will not have the same mass. You can prove this by weighing each. The cup of oil will weigh less.