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
UNO [17]
3 years ago
5

Calculate the molality of the solution. (assume a density of 1.08 g/ml for the solution.)an aqueous nacl solution is made using

140 g of nacl diluted to a total solution volume of 1.20
Chemistry
1 answer:
Anna007 [38]3 years ago
6 0

molality is moles solute / kg of solvent

 

moles of NaCl = mass / molar mass

molar mass NaCl = 58.44 g/mol

moles NaCl = 140 g / 58.44 g/mol = 2.40 mol NaCl

 

The total volume of the solution is 1.2L or 1200 ml

The density of the solution is 1.08 g/ml

 

Therefore the total mass of the solution is 1.08 g/ml x 1200 ml

= 1296 g

 

But there are140 g of NaCl in this solution

 

So mass H2O = 1296 g - 140 g

= 1156 g

= 1.156 kg

 

molality = moles solute/ kg solvent

= 2.40 mol / 1.156 kg

= 2.08 molal

You might be interested in
Prepare a journal about the topic Water-The Life Giving Liquid
Alex

Water is known as a life-giving liquid because every living organism depends on the water for its survival.

<h3>Journal about the topic Water-The Life Giving Liquid</h3>

Water is also called a life-giving liquid because without water life on earth is not possible. All other living organisms need to consume water to survive and grow in size. We need water for many other activities such as cleaning, washing, cooking and irrigation. Water is essential for all living things including humans, animals and plants. Water is called wonder liquid as it can dissolve large number of substances. This property enables water to be a great solvent. Most of the chemical reactions of the living world is carried out in water as a medium so that's why water is known as Life Giving Liquid.

So we can conclude that Water is known as a life-giving liquid because every living organism depends on the water for its survival.

Learn more about water here: brainly.com/question/1313076

#SPJ1

8 0
1 year ago
Help plz:))) I’ll mark u Brainliest
loris [4]

Answer:

We report an unusual case of mercury vapor poisoning from using a heated tobacco product. The suspect had added grains of mercury into 20 cigarettes in a pack. When a 36-year-old Japanese man inserted one of these cigarettes into the battery powered holder, it was heated to a temperature of 350 °C, and he inhaled vaporized mercury. After using 14 of the cigarettes over 16 h, he noticed he had flu-like symptoms so he visited the hospital. Although no physical abnormalities were revealed, 99 μg/L of mercury was detected in his serum sample. His general condition improved gradually and his whole blood mercury level had decreased to 38 μg/L 5 days later. When the remaining six cigarettes in the pack were examined, many metallic grains weighing a total of 1.57 g were observed. Energy dispersive X-ray fluorescence spectrometry confirmed the grains as elemental mercury. Accordingly, the victim was diagnosed with mercury poisoning. Because the mercury was incorporated into cigarettes, an unusual and novel intoxication occurred through the heating of the tobacco product. Both medical and forensic scientific examination confirmed this event as attempted murder.

Explanation:

3 0
2 years ago
1.
Leya [2.2K]

Answer:

V₂ = 530.5 mL

Explanation:

Given data:

Initial temperature = 20.0°C

Final temperature = 40.0 °C

Final volume = 585 mL

Initial volume = ?

Solution:

Initial temperature = 20.0°C (20+273 = 293 K)

Final temperature = 40.0 °C (40+273 = 323 K)

Solution:

The given problem will be solve through the Charles Law.

According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.

Mathematical expression:

V₁/T₁ = V₂/T₂

V₁ = Initial volume

T₁ = Initial temperature

V₂ = Final volume  

T₂ = Final temperature

Now we will put the values in formula.

V₁/T₁ = V₂/T₂

V₁ = V₂T₁ /T₂  

V₂ = 585 mL × 293 K / 323 K

V₂ = 171405 mL.K / 323 K

V₂ = 530.5 mL

6 0
3 years ago
A battery changes chemical energy into _____.
Sophie [7]
It turns chemical into electricity 
5 0
3 years ago
Read 2 more answers
Assume that coal can be represented by the chemical formula C135H96O9NS. If 4.0 tons of coal is burned, what mass of nitrogen is
Schach [20]

Answer:

0.02 tons of NO produced when 4 tons of coal is burned

Explanation:

From the given,

Chemical formula of coal =  C_{134}H_{96}O_{9}NS

Molecular mass of coal = (134\times12)+(9\times1)+(9\times16)+14+32\,=1906.1gm

Let’s calculate the mass of nitrogen in coal

Percentage\,weight\,of\,nitrogen=\frac{Mass\,of\,nitrogen}{Molecular\,mass\,of coal}

Percentage\,weight/,of/,nitrogen=\frac{14}{1906.1}=0.73%

Amount of coal burnt = 4tons

Amount of NO produced by burning 4tons = 4\,tons\,of\,coal\times \frac{0.73tons}{100\,tons\,of\,coal}=0.0292\,tons

This nitrogen is converted into NO by reacting with atmospheric oxygen.

8 0
3 years ago
Read 2 more answers
Other questions:
  • What's the ratio of atoms of each element in the compound ammonium monohydrogen phosphate (NH4)2HPO4?
    11·1 answer
  • A 520-gram sample of seawater contains 0.317 moles of NaCl. What is the percent composition of NaCl in the water?
    11·1 answer
  • Which mineral, when combined with unabsorbed dietary fat, forms soaps that cannot be absorbed and are excreted in the feces?
    13·2 answers
  • If a snail with a red shell crossed with a white shell, what color would the children have shown in a punter square
    6·1 answer
  • Which choice contains a FALSE statment? A. For the vaporization of liquid benzene ΔH is positive. B. For the formation of 1 mol
    8·1 answer
  • What mass of Na2SO4is needed to make 2.5 L of 2.0 Msolution? (Na = 23 g; S = 32 g; O = 16 g)
    13·1 answer
  • HELP ASAP<br> In which reaction are the atoms of elements rearranged?
    11·2 answers
  • How many sig figs are in the measurment 10010m
    5·1 answer
  • 1.5 atm is the same pressure as... (1 atm<br> 760 mmHg)
    11·1 answer
  • Question 1:
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!