0.057 M is the molarity of a solution prepared by diluting 125 mL of 0.400 M [tex]K_2Cr_2O_7[/tex] with 875 mL of water.
What are moles?
A mole is defined as 6.02214076 × [tex]10^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
Given:
[tex]V_1[/tex] =125 mL
[tex]V_2[/tex] =875 mL
[tex]M_1[/tex] =0.400 M
[tex]M_2[/tex] =?
[tex]M_1 V_1[/tex]=[tex]M_2V_2[/tex]
0.400 M x 125 mL = [tex]M_2[/tex] x 875 mL
0.05714285714 =[tex]M_2[/tex] = 0.057 M
Hence, 0.057 M is the molarity of a solution prepared by diluting 125 mL of 0.400 M [tex]K_2Cr_2O_7[/tex] with 875 mL of water.
Learn more about moles here:
https://brainly.com/question/8455949
#SPJ2
