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
ddd [48]
3 years ago
8

How many total atoms are in 0.210 g of P2O5?

Chemistry
1 answer:
GuDViN [60]3 years ago
6 0
M ( P 2 O 5) = 0.210 g
M ( P 2 O 5 ) = 2 * 30 + 5 * 16 ( from the Periodic Table ) =
= 60 + 80 = 140 g/mol
N = m / M = 0.210 g/ 140 g/mol = 0.0015 mol
Avogadro Constant: N a = 6.02 * 10^23 
n = N * N a  = 0.0015 * 6.02 * 10^23 = 
= 0.00903 * 10^23 = 9.03 * 10^20 atoms
You might be interested in
9.Out of the following which is a poly atomic molecule. (H2, CI 2.03.)​
Vikki [24]

the poly atomic molecule is H2

3 0
2 years ago
A cheetah can run 112km/h over a 100-m distance. what is this speed in meters per second
Naya [18.7K]
First convert the 112 km/hr ratio into m/s (meters per second). To do this you multiply 112 km with 1000 m/km (since there's 1000 m in one km). You get 112000 m. Then multiply 1 hr with 60 min/hr (since there's 60 min in one hr. You get 60 min, but you want seconds, so multiply 60 min with 60 s/min to get 3600 s. There you go! Your answer is the speed of 112000m/3600s, but you can simplify that to 31.11m/s (since the answer should be in ? meters per 1 second.

Also, the "100-m-distance" part of the question is just to throw you off, because one particular speed obviously stays constant over any distance. Hope that helps :)
7 0
3 years ago
What is the frequency of a radio wave with a a wavelength of 3 m? (Hint: MHz
Ostrovityanka [42]

Answer:
a. 1 x 10^8

Explanation:

100 MHz = 100,000,000 Hz = 10^8 Hz

4 0
2 years ago
What is the empirical formula for a compound that is 82.2% nitrogen and 17.8% hydrogen?
Stolb23 [73]
Empirical formula=CH3
3 0
3 years ago
Given that Kp [NOTE: Kp!!!!] = 1.39 at 400 ºC for the reaction, P4(g) <=> 2 P2(g), which answer best describes the reactio
Igoryamba

Answer:

The reaction will proceed to the left to attain equilibrium.

Explanation:

The question is missing but I guess it must be about <em>how the reaction will proceed to attain equilibrium.</em>

First, we have to calculate the partial pressures using the ideal gas equation.

pP_{4}=\frac{2.50mol\times (0.08206atm.L/mol.K)\times 673K}{25.0L} =5.52atm

pP_{2}=\frac{1.50mol\times (0.08206atm.L/mol.K)\times 673K}{25.0L}=3.31atm

Now, we have to calculate the reaction quotient (Qp).

Qp=\frac{pP_{2}^{2}}{pP_{4}} =\frac{3.31^{2} }{5.52} =1.98

Since Qp > Kp, the reaction will proceed to the left to attain equilibrium.

3 0
2 years ago
Other questions:
  • What element is used in light bulbs as a filament???? help rly need help
    8·1 answer
  • If each of the following compounds/ions were placed between 2 electrically charged plates (one positive and one negative) Which
    5·1 answer
  • A compound has a chemical composition of 97.6 g carbon, 4.9 g hydrogen, 52 g oxygen, 45.5 g nitrogen. What is the empirical form
    15·1 answer
  • Ameadow food chain is shown.
    5·2 answers
  • A plasma-screen TV contains thousands of tiny cells filled with a mixture of Xe, Ne, and He gases that emits light of specific w
    10·1 answer
  • Which of the below elements are part of a group? Feel free to use the periodic table.
    8·2 answers
  • Determine molar mass! help please
    10·1 answer
  • NEED HELP ASAP!!!!!!!!!!!!!!!!!!!!!!!!!
    5·1 answer
  • If 2.0 mol of Zn is mixed with 3.0 mol<br> of HCl, which reactant will be limiting?
    14·1 answer
  • Haley recorded several notes in her lab journal about the experiment. Which of her notes below is an interpretation of the data
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!