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Shirin D

Numerade Educator

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Educator Statistics

Numerade tutor for 4 years

277 Students Helped

Shirin's Quick Ask Videos

04:09

Chemistry 101

Calculate the mole fraction of solute and solvent in a 5.0 m
solution of sodium chloride. The solution was prepared in
water.

03:40

Chemistry 101

Ivanka brings a 750 mL cup of coffee to class. If she drinks the cup of coffee, how many moles of hydrogen has she consumed? (Assume the pH of the coffee is 5.)
How many hydrogen ions has she consumed?

09:34

Chemistry 101

The standard heat of formation of PCl3(l) is -320 kJ/mol and the PCl bond energy is 326 kJ/mol. The standard heat of formation of P(g) is 334 kJ/mol and that of Cl2(g) is 0 kJ/mol. The Cl2 bond energy is 239 kJ/mol.
Estimate the heat of vaporization of PCl3. [PCl3(l) -> PCl3(g)]

04:10

Chemistry 101

A solution is made containing 21.6 g of phenol (C6H5OH) in 455 g of ethanol (CH3CH2OH).
a. Calculate the mole fraction of phenol.
b. Calculate the mass percent of phenol.
c. Calculate the molality of phenol.

05:12

Chemistry 101

Calculate the volume of concentrated HCL (12 M) needed
to convert 1.5 g of sodium benzoate back to benzoic acid.
Please show all your work. Thanks.

04:36

Chemistry 101

which noble gas configuration do the metal ions end up like?

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