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
olga55 [171]
3 years ago
10

A train travels 65 km in three hours and then 52 km in two hours. What is its average speed?

Chemistry
1 answer:
Darya [45]3 years ago
5 0

the average speed is 23.4 km per hour cause it is total distance over total time equal to average speed

You might be interested in
B. if 6.73 g of na2co3 is dissolved in enough water to make 250. ml of solution, what is the molar concentration of sodium carbo
BARSIC [14]

Answer:- [Na_2CO_3]=0.254M , [Na^+]=0.508 M , [CO_3^2^-]=0.254M

Solution:- We are asked to calculate the molarity of sodium carbonate solution as well as the sodium and carbonate ions.

Molarity is moles of solute per liter of solution. We have been given with 6.73 grams of sodium carbonate and the volume of solution is 250.mL.  Grams are converted to moles and mL are converted to L and finally the moles are divided by liters to get the molarity of sodium carbonate.

Molar mass of sodium carbonate is 105.99 gram per mol. The calculations for the molarity of sodium carbonate are shown below:

\frac{6.73gNa_2CO_3}{250.mL}(\frac{1mol}{105.99g})(\frac{1000mL}{1L})

= 0.254MNa_2CO_3

So, molarity of sodium carbonate solution is 0.254 M.

sodium carbonate dissociate to give the ions as:

Na_2CO_3(aq)\rightarrow 2Na^+(aq)+CO_3^2^-

There is 1:2 mol ratio between sodium carbonate and sodium ion. So, the molarity of sodium ion will be two times of sodium carbonate molarity.

[Na^+]=2(0.254M) = 0.508 M

There is 1:1 mol ratio between sodium carbonate and carbonate ion. So, the molarity of carbonate ion will be equal to the molarity of sodium carbonate.

[CO_3^2^-]=0.254M


5 0
3 years ago
Please help do not get thanks
slega [8]
5. A
this is the answer check it out
6 0
3 years ago
What does sound travel slowest through? Rock, Steel, Air, or Water?
tatyana61 [14]
Through Air sounds travels approximately 343 meters/second. Why the difference? Because the closer together the molecules in a substance are, the faster sound will travel through that medium.
5 0
3 years ago
Read 2 more answers
Ni4+ + _____e- LaTeX: \longrightarrow⟶ Nix+
stich3 [128]
Kdd was he e shxiuw r thai ed
4 0
3 years ago
Given the incomplete equation representing a reaction:
Akimi4 [234]
O is what should go in the blank. O stands for Oxygen.
3 0
3 years ago
Other questions:
  • A chemist needs to know the concentration of some NaOH that is in the laboratory. To find this out, she titrates a 50.0 mL sampl
    7·1 answer
  • What are some chemical properties of a crushed can?........explanation please
    13·2 answers
  • How many milliseconds (ms) are there in 3.5 seconds (2)
    5·1 answer
  • Which of the following examples demonstrates acceleration? Question 17 options: A boy running at a constant speed across the str
    10·2 answers
  • URGENT If you take four gas samples with the following pressures: 12.3 atm, 56.7 atm, 1.09 atm, and 32.6 atm. What is the total
    10·1 answer
  • What is the mass percent of nitrogen in lead (ii) nitrate (pb(no3)2)?
    12·1 answer
  • Element Y has a half-life of 120 years. If you started off with a sample of 280 atoms of Element Y, how many would be left
    7·1 answer
  • What is the mass of 5 moles of Nitrogen gas
    6·1 answer
  • Matter can be pure or mixed
    7·1 answer
  • Please help me with my work<br>​
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!