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Sergeu [11.5K]
3 years ago
12

How many moles are in 9.461 * 10^24 formula units of manganese(iii) dichromate?

Chemistry
1 answer:
olga nikolaevna [1]3 years ago
5 0
1 mole ------------- 6.02x10²³ molecules
?? moles ---------- 9.461x10²⁴ molecules

1  x ( 9.461x10²⁴ ) / 6.02x10²³ =

9.461x10²⁴ / 6.02x10²³ => 15.71 moles

hope this helps!
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5. How many moles are in 58.6 L of Nitrogen gas (N.) at STP?
pantera1 [17]

Answer:

2.6166 moles

Explanation:

stp means: T=273k   p=101.3kpa

R= 8.31(constant)       v=58.6  

using the ideal gas law; pv=nRt

                                        101.3 x 58.6 = n x 8.31 x 273

                                         n= (101.3 x 58.6)\(8.31 x 273)

                                         n= 2.6166moles

6 0
3 years ago
A refrigerator uses_________________________ energy to move the_________________________ through the refrigerator pipes.
denis23 [38]

Answer:

thermal; coolant

Explanation:

A refrigerator transfers thermal energy from the cool air inside the refrigerator to the warm air in the kitchen. I hope this helps! ^-^

7 0
2 years ago
Read 2 more answers
In a 5.609g of H20, how many molecules H20<br> arc<br> present?
nignag [31]

Answer:

1.88 x 10²³molecules of H₂O

Explanation:

Given parameters:

Mass of H₂O  = 5.609g

Unknown:

Number of molecules of  H₂O  = ?

Solution:

To solve this problem, we need to find the number of moles of given compound first.

 Number of moles  = \frac{mass}{molar mass}  

Molar mass of  H₂O = 2(1) + 16  = 18g/mol

 Number of moles  = \frac{5.609}{18}   = 0.31mole

From mole concept;

            1 mole of a substance contains 6.02 x 10²³molecules

       0.31 mole of H₂O will therefore contain 0.31 x 6.02 x 10²³molecules

                                             = 1.88 x 10²³molecules of H₂O

       

8 0
3 years ago
Which of these solutes raises the boiling point of water the most?
VMariaS [17]
Raising of the boiling point is a colligative property. That means that it depends on the number of particles dissolved. The greater the number of particles the greater the increase in the boiling point. So, you can compare the effect of these solutes in the increase of the boiling point by writing the chemical equations and comparing the number of particles dissolved: 1)ionic lithium chloride, LiCl(s) --> Li(+) + Cl (-) => 2 ions; 2) ionic sodium chloride, NaCl(s) --> Na(+) + Cl(-) => 2 ions; 3) molecular sucrose, C12H22O11 (s) ---> C12H22O11(aq) => 1 molecule; 4) ionic phosphate, Na3PO4 --> 3Na(+) + PO4 (3-) => 4 ions; 5) ionic magnesium bromide, MgBr2 --> Mg(2+) + 2 Br(-) => 3 ions. <span>So, ionic phosphate produces the greatest number of particles and it will cause the greatest increase of the boiling point.</span><span />
4 0
3 years ago
At a certain temperature this reaction follows first-order kinetics with a rate constant of 0.184 s^-1 ? Suppose a vessel contai
meriva

Answer:

0.57 M

Explanation:

rate = change in concentration /time

Initial concentration of Cl2O5 = 1.16 M

Let the concentration of Cl2O5 after 5.70 seconds be y

rate = (1.16 - y)/5.7

The reaction follows a first order

Therefore, rate = ky = 0.184y

0.184y = (1.16 - y)/5.7

0.184y × 5.7 = 1.16 - y

1.0488y + y = 1.16

2.0488y = 1.16

y = 1.16/2.0488 = 0.57 M

Concentration of Cl2O5 after 5.70 seconds is 0.57 M

6 0
3 years ago
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