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Evgesh-ka [11]
3 years ago
11

How many molecules are in 2.00 mol of water?

Chemistry
1 answer:
densk [106]3 years ago
7 0

There are 1.2044 × 10²⁴ molecules in 2 moles of water.

Explanation:

Given: 2 moles of water.

To convert moles of water into molecules by multiplying the number of moles by Avogadro's number (6.022 × 10²³ molecules).

We have to find the number of molecules as,  

Number of molecules = Moles × Avogadro's number

Plugin the values as,  

Number of molecules = 2 × 6.022 × 10²³ molecules

                                    = 1.2044 × 10²⁴ molecules.

So there are 1.2044 × 10²⁴ molecules in 2 moles of water.

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What land feature creates new land? <br> Glacier <br> Basin<br> Volcano <br> Desert
schepotkina [342]

Answer:

Volcano

Explanation:

this is because Volcanoes erupt and the molten lava hardens and builds up to make land masses

3 0
4 years ago
What is the ph of a 0.40 m h2se solution that has the stepwise dissociation constants k a1 = 1.3 × 10-4 and k a2 = 1.0 × 10-11?
umka2103 [35]
First, we can neglect the Ka2 value and use Ka1:

according to this equation and by using the ICE table:

              H2Se ⇄  H+ +HSe-
initial    0.4 M         0       0 
change  -X             +X        +X 
Equ      (0.4-X)         X           X

so,

Ka1 = [H+][HSe-] / [H2Se]

so by substitution:

1.3 x 10^-4 = X*X / (0.4 -X) by solving for X

∴X  = 0.00715

∴[H+] = 0.00715 m

∴PH = -㏒[H+]
        = -㏒ 0.00715
        = 2.15
3 0
3 years ago
How many grams of CaCl2 are in 250 mL of 2.0 M CaCl2?
Tom [10]
The answer is:  " 56 g CaCl₂ " .
__________________________________________________________

Explanation:
__________________________________________________________
2.0 M CaCl₂  = 2.0 mol CaCl₂ / L  ; 

Since: "M" = "Molarity" (measurement of concentration); 

                  = moles of solute per L {"Liter"} of solution.
__________________________________________________________
Note the exact conversion:  1000 mL = 1 L . 

Given: 250 mL ;   

250 mL = ?  L  ?  ;  


250 mL * (1 L / 1000 L) =  (250/1000) L = 0.25 L . 
___________________________________________________________
 
(2.0 mol CaCl₂ / L ) * (0.25L) = (2.0) * (0.25) mol  = 0.50 mol CaCl₂ ;

We have: 0.50 mol CaCl₂ ;  Convert to "g" (grams):

→ 0.50 mol CaCl₂  .
___________________________________________________________
1 mol CaCl₂ = ? g ?

From the Periodic Table of Elements:

1 mol Ca = 40.08 g

1 mol Cl  =  <span>35.45 g .
</span>
There are 2 atoms of Cl in " CaCl₂ " ;  

→ Note the subscript, "2", in the " Cl₂ " ; 
__________________________________________________________
So, to calculate the molar mass of "CaCl₂" :

40.08 g  +  2(35.45 g) = 

40.08 g  +  70.90 g = 110.98 g ;  round to 4 significant figures; 

                                 → round to 111 g/mol .
__________________________________________________________
So:

→  0.50 mol CaCl₂  = ? g CaCl₂  ? ; 

→  0.50 mol CaCl₂ * (111 g CaCl₂ / mol CaCl₂) ;

                                             = (0.50) * (111 g) CaCl₂ ;

                                             =  55.5 g CaCl₂  ;

                                                → round to 2 significant figures; 

                                                →  56 g CaCl₂ .
___________________________________________________________
The answer is:  " 56 g CaCl₂ " .
___________________________________________________________
6 0
3 years ago
Read 2 more answers
Is it a spontaneous or non-spontaneous change?
joja [24]
Spontaneous is no spontaneous
7 0
3 years ago
What is the weight of a 90kg man standing on Earth, where gᵉᵃʳᵗʰ = 9.82 m/s^2?
Ray Of Light [21]

Answer:

88.38 Kgm/s^2

Explanation:

Mass and weight are quite different terms .

Weight is defined as the amount of force exerted on the earth due to our mass and gravity of acceleration.

W=m*g

Given that the mass is 90 kg and gravity of acceleration of earth is 9.82 m/s^2.

So weight will be

W=90*9.82\\\\ W=88.38 Kgm/s^2

So this is the weight of the 90kg man standing on earth.

7 0
3 years ago
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