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
Jet001 [13]
3 years ago
14

How many moles of NaCl must be dissolved in 0.5 L of water to make a 4 mole/L

Chemistry
1 answer:
kvv77 [185]3 years ago
5 0
C = 4 mol/l
v = 0.5 l

n(NaCl)=cv

n(NaCl) = 4 mol/l · 0.5 l = 2 mol

2 moles of NaCl must be dissolved

You might be interested in
A coal-burning power plant produces 500 megawatts of electricity while burning 225,000 kg of coal per hour (almost 250 tons each
kolbaska11 [484]

Answer:

40%

Explanation:

The efficiency of a plant is determined by

eff=\frac{E_{produced}}{E_{in}}

Our produced energy is

500 \ MW

While the input energy can be calculated

E_{in}=number\ of \ coal \ in \ * energy\ per\ coal\ unit\\ =\frac{225000}{3600}coal/ s\ *20\ MJ/coal\\ = 1250\ MW

So, the efficiency of plant is

eff=\frac{500}{1250}}\\ 0.4

or 40% efficient

6 0
3 years ago
Can u guys help on 22. It will only take a min.
Anni [7]

Answer:

Alpha > beta>gamma

Explanation:

Comparing only the three common types of ionizing radiation, alpha particles have the greatest mass. Alpha particles have approximately four times the mass of a proton or neutron and approximately 8,000 times the mass of a beta particle.

Gamma radiation, unlike alpha or beta, does not consist of any particles, instead consisting of a photon of energy being emitted from an unstable nucleus. Having no mass or charge, gamma radiation can travel much farther through air than alpha or beta, losing (on average) half its energy for every 500 feet.

7 0
3 years ago
Read 2 more answers
What is the main function of this organ system It protects vital organs from injury. It is the first line of defense and keeps t
liraira [26]

Answer:

Organ systems & their main functions

Explanation:

The chest bones Rib Cage & spine - protects the vital organs (heart, lung,liver) from injury & provides structural support for body.

Skin is the body's first line of defense & keeps the body warm. In case of any invading infection, fever - body temperature rise fights it.

Circulatory system (containing heart) & its body fluid blood -  transports nutrients and oxygen to body cells

Endocrine system regulates growth, produces hormones - that target organs via bloodstream.

4 0
3 years ago
During an experiment a thermometer was placed in a beaker containing hydrogen peroxide. The following observations were recorded
Rudiy27

Answer:

Chemical

Explanation:

The change was chemical, because it can no longer be returned to the original form. You cannot get back the bubbles or fizz from the air.

3 0
3 years ago
Read 2 more answers
Hurry please quick summary
Nadya [2.5K]
I think that work is being done on the books because they are being moved to their proper location and they will be sorted properly rather than lying on a table. Without lifting or carrying, you could sort the books by their genre or title name on the bookshelf so it will be sorted much more efficiently.

I’m not sure if this is the answer you are looking for but I hope it helps :)
3 0
3 years ago
Other questions:
  • 2.15 Liters of helium gas at a pressure of 58 kPa and a temperature of 25 degrees celsius, what is the new volume at stp?
    15·1 answer
  • What might happen if earth did not rotate on its axis?
    6·1 answer
  • A: what is inside the planet earth? b: how did it get that way? c: how does the inside of earth affect the surface of the earth
    11·1 answer
  • As ice melts from a solid to a liquid, A) entropy increase
    7·1 answer
  • Which of the following solutions is a good buffer system?A solution that is 0.10 M HCN and 0.10 M NaClA solution that is 0.10 M
    5·1 answer
  • How can a mixture of ammonia and hydrogen be seperated?
    12·2 answers
  • PLZ HELP I WILL GIVE U BRAINEST PLZ!!!!!
    7·2 answers
  • Which ion formation takes more energy: K+ or Li+?
    15·1 answer
  • ☆ Electrons are much more unpredicable<br> the what bour said
    8·1 answer
  • Over time, what color will all the fish be because of natural selection?
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!