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4 years ago

Calculate the molarity of a solution prepared by diluting 575

Chemistry

1 answer:

charle [14.2K]4 years ago

7 0

Answer:

Explanation:

Given parameters:

Volume of solution = 575mL

Concentration of solution = 0.9M

New volume = 1.25L

Unknown:

New concentration = ?

Solution:

Since the number of moles remains the same, we can use this parameter to solve the problem given.

Concentration = $\frac{number of moles}{volume}$

Number of moles of solution before diluting = concentration x volume

Number of moles = 0.9 x 575 x $\frac{1}{1000}$ = 1.565 moles

New concentration = $\frac{number of moles }{volume}$ = $\frac{1.565}{1.25}$ = 1.25M

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QveST [7]

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According to Hess’s law, the chemical equation can be treated as algebraic expressions and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

$P_4(s)+6Cl_2\rightarrow 4PCl_3$ $\Delta H_1=-2439kJ$ (1)

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Now dividing equation (4) by 4, we get

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8 0

3 years ago

Explain what happens to the particles in a substance during a physical change. plllzzzzz hurry!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Reptile [31]

Answer:

When a physical change occurs, the arrangement of particles within the substance may change, but the atoms in the molecules remain bonded together.

Explanation:

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3 years ago

true or false in a chemical reaction the same number of each type of atom will always be present before and after the reaction t

iren [92.7K]

Answer:

True

Explanation:

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2 years ago

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Explanation:

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3 years ago

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balandron [24]

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