500
Density is found by dividing Mass by volume where mass is in grams and volume is in milliliters. 20 liters=20,000 ml so the calculation becomes 158/20,000 which yiels a result of .0079
The molar mass of water (H2O) is 18. Ice is water in it's solid state.
magnesium
The work function of an unknown metal is the minimum amount of energy needed to remove an electron from its surface.
iron
that is supposed to be unknown until you figure it out.
A sample of an unknown metal has a mass of 35.4g and a volume of 3.11cm^3. The metal is Lead.
An unknown man, in the prehistoric times.
count the protons and neutrons
Kouton = Metal Elements. It is unknown which elements make it.
because it may have an adverse reation to the metal, for example and acid would react with the metal and disolve it!
Raidens age is unknown