Answer is attached below ( sorry for mistake )
El Niño = the boy, La Niña = the girl. You can tell from the ending and the first word.
Answer:
A. State of matter of the substance.
Explanation:
During a chemical change, the composition of matter always changes.
We are given initially with 1.2 x 1024 molecules of water, added further with <span>5.0 moles of water. we are asked to determine the total number of molecules of water after the addition. We just </span> convert the number of moles to number of molecules. 5 moles of water is equal to 3.011x 10^24 molecules. The total number is that we add the initial and the additional, equivalent to 4.211 x10^24 molecules.
Answer:
A 10% (v/v) methanol solution can be made by adding 10 mL of methanol to 100 mL of water, while a 10% (m/m) methanol solution can be made by adding 10 g of methanol to 90 g of water
Explanation:
This percents are a sort of concentrations:
v/v means volume of solute in 100 mL of solution
m/m means mass of solute in 100 g of solution
Certainly in solutions that can be made by two liquids, we don't consider additive, the volumes.
In m/m, as the percent are the grams of solute in 100 g of solution, we consider the mass of water (generally the solvent) as 100 g - x % of solute
Mass of solution = Mass of solvent + Mass of solute