Chemistry: A chemist prepares a solution by adding 293 mgmg of K2Cr2O7K2Cr2O7 (MWMW = 294.19 g/molg/mol ) to a volumetric flask, and then adding water until the total volume of the contents of the flask reaches the calibration line that indicates 250 mLmL . Determine the molarity of the prepared solution.

A chemist prepares a solution by adding 293 mgmg

Ответ:

chey1603

23.01.2022

Chemistry

The molarity of solution will be 0.00325 M

Explanation:

Molarity : It is defined as the number of moles of solute present per liter of the solution.

Formula used :

$Molarity=\frac{n\times 1000}{V_s}$

where,

n= moles of solute = $\frac{\text{Given mass}}{\text{Molar mass}}$

given mass = 239 mg = 0.239 g (1g=1000mg)

moles of $K_2Cr_2O_7=\frac{0.239g}{294.19g/mol}=8.12\times 10^{-4}mol$

${V_s}$ = volume of solution in ml = 250 ml

Now put all the given values in the formula of molarity, we get

$Molarity=\frac{8.12\times 10^{-4}\times 1000}{250ml}=3.25\times 10^{-3}mole/L$

Therefore, the molarity of solution will be 0.00325 M

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Ответ:

Clerry

17.06.2021

Chemistry

your answer would be C.

Explanation:

Machines make work easier by increasing the amount of force that is applied, increasing the distance over which the force is applied, or changing the direction in which the force is applied. sorry if im wrong.

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A chemist prepares a solution by adding 293 mgmg of K2Cr2O7K2Cr2O7 (MWMW = 294.19 g/molg/mol ) to a volumetric flask, and then adding water until the total volume of the contents of the flask reaches the calibration line that indicates 250 mLmL . Determine the molarity of the prepared solution.

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