Chemistry, 11.12.2019 00:31 rashawng2005

Determine the molarity of a solution that is prepared by adding 600 ml of water to a 200 ml of 0.450 m solution of k2cr2o7 ?

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Answer from: kanamek

0.1125 M

Explanation:

Molarity of a solution is number of moles of solute dissolved in 1 L of solution

600 mL of water is added to 200 mL of a 0.450 M solution of K₂Cr₂O₇

number of moles of K₂Cr₂O₇ remain the same but more water is added therefore volume changes making the solution more dilute

first we need to find the number of moles of K₂Cr₂O₇ already in solution

molarity = number of moles of K₂Cr₂O₇ / volume of solution

substituting values in the equation

0.450 mol/L = number of moles / 0.2 L

number of moles = 0.09 mol

there are 0.09 mol of K₂Cr₂O₇ and the new volume is 200 mL + 600 mL = 800 mL

molarity = 0.09 mol / 0.8 L

molarity = 0.1125 mol/L

new molarity is 0.1125 M

Answer from: Quest

explanation:

metals have excess of electrons whereas non-metals have deficiency of electrons. thus, in order to gain stability metals easily donate their electrons to the non-metals.

for example, electronic configuration of sodium is $1s^{2}2s^{2}2p^{6}3s^{1}$ and electronic configuration of phosphorous is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{3}$ .

when a phosphorous atom and sodium atom combine together then sodium will donate is extra one electron to the phosphorous atom. as a result there will be formation of ionic bond between sodium and phosphorous.

the reaction will be as follows.

$3na + p \rightarrow na_{3}p$

there, are three sodium sodium atoms and each of them will donate its one extra electron to phosphorous atom. thus, the sub-shell of phosphorous gets completely filled.

thus, we can conclude that electrons are transferred from atoms of sodium to atoms of phosphorous. this transfer makes the sodium atoms donate one electron and the phosphorous atoms to gain one electron. as a result, the sodium and phosphorus atoms strongly attract each other.

Electrons are transferred from atoms of to atoms of this transfer makes the sodium atoms and the

Answer from: Quest

solute : a solute is a substance that is dissolved in another substance is known as a solvent. it is mixed with a special mixture know as homogeneous mixture.

solvent: a solvent is a substance that dissolved a solute, which results in a solution is known as solvent.

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Determine the molarity of a solution that is prepared by adding 600 ml of water to a 200 ml of 0.450...

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