mccantshope mccantshope

10-10-2016
Chemistry

contestada

A 20.0 mL sample of a NaCl solution has a mass of 21.040 g. After the solution is evaporated to dryness, the dry salt residue has a mass of 4.348 g. Calculate the following concentrations for the NaCl solution.
a) Mass/mass%
b) Mass/volume%
c) Molarity (M)

Respuesta :

scme1702 scme1702

12-10-2016

Mass NaCl = 4.348
Mass solution = 21.040 - 4.348 = 16.692
mass/mass % =
4.348/16.692
= 26%
mass/vol % =
21.7%
Molecular mass of NaCl = 58.5
Moles of NaCl = 0.074
Volume of solution = 0.02 L
Molarity = 3.7 mol/Liter

Answer Link

Otras preguntas

Which book led to the movement to protect the enviroment

1.Two negative modifiers used with the verb of a sentence are called . A. Dangling Modifiers B. Double Negatives C. Emphasizing Modifiers 2. Dangling modifier

regularly schedule physical activity

Why do injuries happen frequently for people who do not exercise? (A) Their bodies are too relaxed. (B)Their minds are not prepared. (C) Their bodies are no

Alec is a boxer and just added an extra day of training to his routine. What training principles is Alec applying?

Sam leases a car for 24 months. The car will cost him $7,000 if he decides to buy it at the end of the lease. What term describes the $7,000? A. interest B. res

1.Vertical columns in the periodic table indicate what information? A.periods B.liquids C.synthetic elements D.groups and families 2.Which of these are families

Select all of the following that are essential to an effective introduction to a literary analysis. A memorable clincher The author and title of the work A

Urine produced in the kidneys is carried to the bladder through a pair of tubes called _____.Select one of the options below as your answer: A. Urethra B. Urete

the distance from earth to mars is about 35,000,000 miles. What is the order of the magnitude of this number?