1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Triss [41]
3 years ago
11

. Calculate the molality of each of the following solutions: (a) 0.710 kg of sodium carbonate (washing soda), Na2CO3, in 10.0 kg

of water—a saturated solution at 0°C (b) 125 g of NH4NO3 in 275 g of water—a mixture used to make an instant ice pack (c) 25 g of Cl2 in 125 g of dichloromethane, CH2Cl2 (d) 0.372 g of histamine, C5H9N, in 125 g of chloroform, CHCl3
Chemistry
1 answer:
Step2247 [10]3 years ago
4 0

Answer:

a)0.67 molal

b) 5.67 molal

c) 2.82 molal

d) 0.0268 molal

Explanation:

Step 1: Data given

Molality = moles solute / mass solvent

(a) 0.710 kg of sodium carbonate (washing soda), Na2CO3, in 10.0 kg of water—a saturated solution at 0°C

Calculate moles of Na2CO3 =  710 grams / 105.99 g/mol = 6.70 moles

Molality = 6.70 moles / 10 kg = 0.67 molal

(b) 125 g of NH4NO3 in 275 g of water—a mixture used to make an instant ice pack

Calculate moles of NH4NO3 = 125 grams / 80.04 g/mol = 1.56 moles

molality = 1.56 moles / 0.275 kg = 5.67 molal

(c) 25 g of Cl2 in 125 g of dichloromethane, CH2Cl2

Calculate moles Cl2 = 25 grams / 70.9 g/mol= 0.353 moles

Molality = 0.353 moles / 0.125 kg = 2.82 molal

0.372 g of histamine, C5H9N, in 125 g of chloroform, CHCl3

Calculate moles histamine = 0.372 grams / 111.15 g/moles = 0.00335 moles

Calculate molality = 0.00335 moles / 0.125 kg = 0.0268 molal

NOTE: histamine is C5H9N3 not C5H9N

You might be interested in
Necesito ayuda con esto y si es necesario con procedimientos, gracias
BaLLatris [955]

Answer:

sorry but I don't understand Spanish

otherwise I will definitely helps you

7 0
2 years ago
Read 2 more answers
How does Controlled fires help prevent real forest fires?
Salsk061 [2.6K]

Answer:

it burns things which would be burned easily by lightning, and then people put the fire out immediately.  If the dried plants that they are lighting on fire are hit by lightning, it can lead to a massive fire without anyone realizing.  

6 0
2 years ago
the chemical formula for copper iodide is Cul. How many atoms of copper(Cu) is it made from? How many atoms of iodine(I)?
Alexandra [31]
<span>The molecule contains one atom of copper and one atom of iodine. They are connected by an ionic bond because the copper takes a positive charge and the iodine has a negative charge before they are bonded. These opposing charges are negated when the two elements come together.</span>
7 0
2 years ago
How does urban sprawl affect water consumption?
Vesnalui [34]

Answer:

Urban sprawl is the development in urban areas

Due to which people are migrating from rural areas to urban areas to get the jobs or their income sources due to the opportunities.

So, as population is increasing in the urban areas. The food consumption and water consumption will also increase.

So, this is how urban sprawl affect water consumption.

5 0
3 years ago
Read 2 more answers
What is SEAgel help plz
DanielleElmas [232]

SEAgel (Safe Emulsion Agar gel) is one of a class of high-tech foam materials known as aerogels.

5 0
2 years ago
Read 2 more answers
Other questions:
  • How big is the ocean of Spokane?
    14·1 answer
  • Describe the difference between physical and chemical changes in terms of what happens to the matter
    12·1 answer
  • The client's lab values are sodium 166 mEq/L, potassium 5.0 mEq/L, chloride 115 mEq/L, and bicarbonate 35 mEq/L. What condition
    8·1 answer
  • What country was overrun by the Japanese
    9·2 answers
  • Why doesn't light get absorbed
    10·1 answer
  • Physical science 6.06 part one
    10·1 answer
  • If a given solution contains 3.55 mol of calcium hydroxide, and the solution as a molarity of 0.667 M, what is the volume of the
    9·1 answer
  • _______ are used because they're economical, easy to process, easy to transport, and the infrastructure exists for their storage
    15·1 answer
  • How does gravity affect the rain during a rainstorm?
    13·2 answers
  • State the two laws of chemical combination.​
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!