B) The mass percentage of a solution is the ratio of the mass of solute to the mass of solvent expressed as a percentage. This becomes:
mass % = (NaCl mass) / (water mass) x 100
Mass % = 20 / 250 x 100
Mass % = 8%
C)
The molarity of a solution is the moles of solute present per liter of solution. The volume of the solution is:
250 mL = 0.25 L
Moles = mass / Mr
Moles = 20 / 58.44
Moles = 0.34
Molarity = moles / liter
Molarity = 0.34 / 0.25
Molarity = 1.36 M
It’s D, you can tell because there electrons w the highest energy it would be faster
Alchemists used science together with magic to accomplish tasks.
4H202->2H2O+O2
Hope this helps mate good luck on whatever ur doing
