Answer:
C)
Explanation:
M1V1 = M2V2
40.0ml*0.25M = M2*50.0ml
M2 = 40.0*0.25/50.0 = 0.20 M
Answer:
A volumetric flask is lab glass or plasticware used to prepare a solution. It is used to make up a solution to a known volume. Volumetric flasks are used to measure volumes much more precisely than beakers or Erlenmeyer flasks.
Number of moles:
1.0 mole CH4 -------------- 22.4 L
moles ------------- 30 L
moles CH4 = 30 * 1 / 22.4 = 1.339 moles
Therefore:
1.0 mole CH4 --------------- 6.02x10²³ molecules
1.339 moles ---------------- molecules CH4
molecules CH4 = ( 1.339 ) * ( 6.02x10²³ ) / 1.0
=> 8.6x10²³ molecules CH4