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Maru [420]
3 years ago
8

How many atoms doesCo(NO3)2 have

Chemistry
2 answers:
svet-max [94.6K]3 years ago
7 0
The answer is 9. Calcium nitrate is made up
of 3 different elements that equal 9 atoms.
Leno4ka [110]3 years ago
5 0
9 (I had this on a test and got it right)
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12. If a solution has a pH of 3, what would the pOH value of that solution be? *
butalik [34]

Answer:

The correct answer is pOH= 11

Explanation:

From the aqueous acid-base equilibrium we know that

pH + pOH = 14

If we know pH, we can calculate pOH as follows:

pOH = 14 - pH

In this problem, the solution has a pH of 3, so:

pOH = 14 - 3 = 11

8 0
2 years ago
Read 2 more answers
23994Pu + 10n → BCBa + 9138Sr + 3 10n
mihalych1998 [28]

Answer:

A

Explanation:

7 0
3 years ago
If 20.0 ml of glacial acetic acid (pure hc2h3o2) is diluted to 1.40 l with water, what is the ph of the resulting solution? the
Y_Kistochka [10]

By using the formula, mass = density x volume, we calculate mass in grams

 20.0 mL CH₃COOH x (1.05 g / mL) = 21.0 g CH₃COOH 

To find the moles, molar mass of CH₃COOH = 60.05g/mol<span>

21.0 g </span>CH₃COOH x (1 mole CH₃COOH / 60.05 g CH₃COOH) = 0.350 moles CH₃COOH 

To find molarity,<span>

[</span>CH₃COOH] = moles CH₃COOH / L of solution = 0.350 / 1.40 = 0.250 M CH₃COOH<span> 

When </span>CH₃COOH is dissolved in water, it produces small and equal amounts of H₃O⁺+ and C₂H₃O₂⁻. 

<span>
Molarity ,         </span>CH₃COOH<span> + H</span>₂O <==> H₃O⁺ + C₂H₃O₂⁻ 

<span> <span>Initial                      0.250                          0           0 </span>
Change                      -x                            x            x 
Equilibrium            0.250-x                        x            x 

K</span>ₐ = [H₃O⁺][C₂H₃O₂⁻] / [HC₂H₃O₂] = (x)(x) / (0.250-x) = 1.8 x 10⁻⁵

<span>Since K</span>ₐ is relatively small, we can neglect the -x term after 0.250 to simplify 

<span>x</span>² / 0.250 = 1.8 x 10⁻⁵ 

x² = 4.5 x 10⁻⁶ 

<span> x = 2.1 x 10</span>⁻³<span> = [H</span>₃O⁺] 

pH = -log [H₃O⁺] = -log (2.1 x 10⁻³) = 2.68

8 0
3 years ago
Explain how mass and energy can be conserved even during a chemical change.
AleksandrR [38]
Mass/ energy can not be created or destroyed 
4 0
3 years ago
When 25.0 grams of water are cooled from 20.0 degrees Celsius to 10.0 degrees Celsius the number of joules of heat energy releas
vodka [1.7K]

Heat energy released here

Q = mass x specific heat capacity of water x deltaT


= 25.0 x 4.184 x (-10.0)


= - 1046 Joules


1046 Joules of heat energy is released in this process.  




     

8 0
3 years ago
Read 2 more answers
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