What mass of K2CrO4 is required to prepare 250cm3 of 0.020 mol dm3 solution? [K2CrO4…

What mass of K2CrO4 is required to prepare 250cm3 of 0.020 mol dm3 solution?
[K2CrO4 = 194.2g mol-1]
  • A.
    0.97g
  • B.
    9.70g
  • C.
    19.42g
  • D.
    97.10g
Correct Answer: Option A
Explanation

1 mole m-3 K2CrO4 contains 194.2g mol-1 in 1000cm3
1 mole m-3 K2CrO4 contains 92.2g mol-1 in 500cm3
1 mole m-3 K2CrO4 contains 48.55g mol-1 in 250cm3
If n molm-3 K2CrO4 contain 48.55
0.02 molm-3 will contain (0.02/1) * (48.55/1) = 0.97g

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