The answer will depend on how much water - a drop, a cupful, a bucketful, a whole lakeful or WHAT!
4,5 grams
This is (mass of solute) divided by (mass of total solution) expressed as a percentage. The solute is what you are dissolving into the solution. Example: you have 90 grams of water, and you add 10 grams of salt (sodium chloride). The water is the solvent, sodium chloride is the solute, and the solution is salt water. 90 grams + 10 grams = 100 grams (mass of total solution). (10 grams) / (100 grams) = 0.1 --> 10% mass mass percent concentration.
27 grams.
500 cubic centimetres of water weighs 500 grams
78.7 grams
The mass of 45 ml of water is approximately 45 grams. The density of water is about 1 gram per milliliter, so 45 ml of water would weigh around 45 grams.
The total mass of the solution would be 160 grams (40 grams of copper chloride + 120 grams of water).
At standard temperature and pressure, ml = grams for water, so at STP, 134.63 ml of water = 134.63 grams.
The prefix "kilo-" means 1000, so 2.5 kilograms would be 2.5 x (1000 grams), or 2,500 grams.
Somehow your data doesn't add up. The mass difference would be 195 - 125 = 70 grams. 1 ml of water weighs roughly 1 gram, so you would expect 70 ml of water to be filled into the beaker. Your water is either contaminated, extremely heavy or its a trick question.
The answer depends on the temperature, but at room temperature (20 deg C), 100 ml of water would have a mass of 99.82 grams.
500 grams
1,000 Grams
specific gravity of 4 4 times the mass of water, which at 50ml would weigh 50 grams.
Properly, one measures mass in grams. 9 milliliters of 4 deg. Celsius water has the mass of 9 grams. That mass would be the same on any planet or even in near weightlessness in space.
1 ml = 1g of water so 25ml would weight 25 grams
18 grams