Multiply the volume in liters (4.00L) by the concentration of the solution in molar (0.250M) to calculate the number of moles of soluto that you need, then multiply the number of moles by the molar mass of sodium hydroxide (39.99 g/mol) to calculate the mass.
4.00L x 0.250 M x 39.99g / 1L = 39.99g
Basically you need one mol of NaOH (39.99g) dissolved in 4 liters of solution.
The answer is true. A liquid boils when its vapor pressure equals the pressure of the atmosphere. At this point, vapor can now readily escape from the liquid phase because it has an equal pressure now with its surrounding which, basically, is in the vapor phase.
Question
Which one is more dangerous Ac or Dc how is it?
Answer
AC
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AC has the voltage alternates, it enter and exit from your body without a closed loop.
Answer:
A complex ion is an energy species ion comprising a central metal ion ligands joined by a dative bond
Explanation:

Answer:
Your observations in writing.