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Oduvanchick [21]
3 years ago
5

For which one of the following is ΔHfo zero?

Chemistry
2 answers:
Vlada [557]3 years ago
6 0
The answer is most likely C
Sholpan [36]3 years ago
3 0
The standard enthalpy of formation is zero for B and D since by definition, the standard enthalpy of formation for an element at its standard state is zero. The monatomic oxygen is not the standard state of oxygen while carbon dioxide is already a molecule. 
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How many milliliters of a 0.266 M RbNO3 solution are required to make 150.0 mL of 0.075 M RbNO3 solution? How many milliliters o
Westkost [7]

Answer : 42.3 ml of a 0.266 M RbNO_3 solution are required.

Solution : Given,

Molarity of RbNO_3 solution 1 = 0.266 M

Molarity of RbNO_3 solution 2 = 0.075 M

Volume of RbNO_3 solution 2 = 150 ml = 0.150 L      (1 L = 1000 ml)

Formula used :

M_1V_1=M_2V_2

where,

M_1 = Molarity of RbNO_3 solution 1

M_2 = Molarity of RbNO_3 solution 2

V_1 = Volume of RbNO_3 solution 1  

V_2 = Volume of RbNO_3 solution 2

Now put all the given values in above formula, we get

0.266M\times V_1=0.075M\times 0.150L\\V_1=0.042293L=42.293ml\approx 42.3 ml                 (1 L = 1000 ml)

Therefore, 42.3 ml of a 0.266 M RbNO_3 solution are required.

8 0
3 years ago
In which state of matter do the particles spread apart and fill all the space available to them?
BlackZzzverrR [31]
I would say c-gas because they float around and spread
7 0
2 years ago
Read 2 more answers
Calculate the poh of this solution. round to the nearest hundredth. ph = 1.90 poh =
Viktor [21]

Answer:

The answer is 5.10

Explanation:

<h3><u>Given</u>;</h3>
  • pH = 1.9
<h3><u>To </u><u>Find</u>;</h3>
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We know that

pH + pOH = 7

pOH = 7 – pH

pOH = 7 – 1.90

pOH = 5.10

Thus, The pOH of the solution is 5.10

6 0
2 years ago
An object becomes electrically charged when:
timurjin [86]

Answer:

An object becomes electrically charged when <em>electrons</em><em> </em><em>are</em><em> </em><em>transferred</em><em> </em><em>to</em><em> </em><em>it</em>

Explanation:

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7 0
3 years ago
N__________ is the study of atoms.
AlekseyPX
I think the answer might be nuclear physics
3 0
3 years ago
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