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morpeh [17]
3 years ago
13

A snowflake contains 2.1 10^18 molecules of water. How many moles of water does it contain?

Chemistry
1 answer:
IgorC [24]3 years ago
6 0

Answer:

divide the # of molecules by avogadros number and get 3.48 x 10^-6

Explanation:

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The ph of a 0.0100 m solution of the sodium salt of a weak acid is 11.00. what is the ka of the acid?
Vitek1552 [10]
The answer is Ka = 1.00x10^-10.
Solution:
When given the pH value of the solution equal to 11, we can compute for pOH as
     pOH = 14 - pH = 14 - 11.00 = 3.00
We solve for the concentration of OH- using the equation
     [OH-] = 10^-pOH = 10^-3 = x

Considering the sodium salt NaA in water, we have the equation
     NaA → Na+ + A- 
hence, [A-] = 0.0100 M

Since HA is a weak acid, then A- must be the conjugate base and we can set up an ICE table for the reaction
                             A- + H2O ⇌ HA + OH-
     Initial             0.0100            0       0
     Change        -x                    +x     +x
     Equilibrium    0.0100-x         x       x

We can now calculate the Kb for A-:
     Kb = [HA][OH-] / [A-] 
           = x<span>²</span> / 0.0100-x
Approximating that x is negligible compared to 0.0100 simplifies the equation to
     Kb = (10^-3)² / 0.0100 = 0.000100 = 1.00x10^-4

We can finally calculate the Ka for HA from the Kb, since we know that Kw = Ka*Kb = 1.0 x 10^-14:
     Ka = Kw / Kb 
           = 1.00x10^-14 / 1.00x10^-4
           = 1.00x10^-10
7 0
3 years ago
What are the products of photosynthesis?
77julia77 [94]
Carbon dioxide and water pretty sure
8 0
3 years ago
Read 2 more answers
3 The volume of a gas is 50.0 mL at 20.0 K. What will be the new
Damm [24]

Answer:

C. 4.00 K

Explanation:

We can solve this using Charles's Law of the ideal gas. The law describes that when the pressure is constant, the volume will be directly proportional to the temperature. Note that the temperature here should only use the Kelvin unit. Before compressed, the volume of the gas is 50ml(V1) and the temperature is 20K (T1). After compressed the volume becomes 10ml(V2). The calculation will be:

V1 / T1= V2 / T2

50ml / 20K = 10ml / T2

T2= 10ml/ 50ml * 20K

T2= 4K

7 0
3 years ago
Help needed ASAP!<br> Thanks for helping!!:)
yulyashka [42]

Answer:

I hope this helps you :)

Explanation:

  1. Question 1 - B
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6 0
2 years ago
Which best compares the particles of the substance when it is in region 1 with the particles of the substance when it is in regi
soldier1979 [14.2K]
Region 1 is solid state, 2 is liquid state and 3 is gaseous state. Using this fact, the correct statement is that, the particle are more orderly in region 1, which is the solid state. The other statements are false.
6 0
3 years ago
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