If a normal blood sample contains 4.5 mEq/L of calcium ion, how many mg of calci

Question

If a normal blood sample contains 4.5 mEq/L of calcium ion, how many mg of calcium are contained in a 25.0 mL blood sample?

What is the final concentration of a solution prepared by using 75.0 mL of 18.0 M H2SO4 to prepare 500 mL of solution?

Calculate the pressure in atmospheres in a motorcycle engine at the end of a compression stroke. Assume at the start of this stroke the pressure of the mixture of the gasoline and air in the cylinder is 0.9813 atm and the volume of the cylinder is 24.2 millimeters at the end of the compression stroke. (There seems to be something missing in this problem, but I am not sure)

Explanation / Answer

1)

1 Litre -------------------------> 4.5 m Eq

equivalent weight = molar mass / valency

molar mass = equivalent wqeight x valency

so Ca valancy = 2

1 Litre ----------------------> 2 x 4.5 mg= 9 mg of Ca+2

25 ml --------------------> ??

Ca+2 = 25 x 9 / 1000 = 0.225 mg

Ca+2 weight = 0.225 mg

2)

in the dilution formula

M1 V1 = M2 V2

18.0 x 75 = M2 x 500

M2 = 2.7 M

final concentration = 2.7 M

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