1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Ksju [112]
4 years ago
9

The number of protons plus neutrons in the atom is called its?

Chemistry
2 answers:
Olegator [25]4 years ago
7 0
The mass number is protons plus neutrons
yKpoI14uk [10]4 years ago
5 0
This is the thing called the mass number of the thing
You might be interested in
How many molecules of calcium chloride are in 3CaCl2
Soloha48 [4]
3*40+3*2*35.5=333* Avogadro’s number =
1.98*10^25
8 0
3 years ago
Please somebody help!!!!!!!!!!!!!
natta225 [31]

Answer:

1.Materials

2. Hypothesis

3.Question

4.Procedure

5.Further questions

6.Results and Data

7.Conclusion

Explanation:

4 0
3 years ago
What is the hybridization and shape for an XeF6 2+ molecule?
Anna11 [10]

Answer:

Xe:[Kr]4d¹⁰5(sp³d³)₆⁺² => Octahedral Geometry (AX₆)⁺²

Explanation:

Xe:[Kr]4d¹⁰(5s²5p₋₁²p₀²p₁²5d₋₂d₋₁d₀)⁺² => Xe[Kr]5(sp³d³)₆²

Ca. #Valence e⁻ = Xe + 6F - 2e⁻ = 1(8) + 6(7) - 2 = 48

Ca. #Substrate e⁻ = 6F = 6(8) = 48

#Nonbonded free pairs e⁻ = (V - S)/2 = (48 - 48)/2 = 0 free pairs

#Bonded pairs e⁻ = 6F substrates = 6 bonded pairs

BPr + NBPr = 6 + 0 = 6 e⁻ pairs => Geometry => [AX₆]⁺² => Octahedron

Xe:[Kr]4d¹⁰(5s²5p₋₁²p₀²p₁²5d₋₂d₋₁d₀)⁺² => Xe[Kr]5(sp³d³)₆⁺²    

XeF₆⁺² => 6(sp³d³) hybrid orbitals => Octahedral Geometry (AX₆)      

8 0
3 years ago
Consider the following reaction: 2CH3OH(g)  2CH4(g) + O2(g) ΔH = +252.8 kJ a) Calculate the amount of heat transferred when 24.
denpristay [2]

<u>Answer:</u>

<u>For a:</u> The amount of heat transferred for the given amount of methanol is 94.6736 kJ.

<u>For b:</u> The mass of methane gas produced will be 10.384 g.

<u>Explanation:</u>

For the given chemical reaction:

2CH_3OH(g)\rightarrow 2CH_4(g)+O_2(g);\Delta H=+252.8kJ

  • <u>For a:</u>

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}} ......(1)

Given mass of methanol = 24.0 g

Molar mass of methanol = 32.04 g/mol

Putting values in above equation, we get:

\text{Moles of methanol}=\frac{24.0g}{32.04g/mol}=0.749mol

By Stoichiometry of the reaction:

For every 2 moles of methanol, the amount of heat transferred is +252.8 kJ.

So, for every 0.749 moles of methanol, the amount of heat transferred will be = \frac{252.8}{2}\times 0.749=94.6736kJ

Hence, the amount of heat transferred for the given amount of methanol is 94.6736 kJ.

  • <u>For b:</u>

By Stoichiometry of the reaction:

252.8 kJ of energy is absorbed when 2 moles of methane gas is produced.

So, 82.1 kJ of energy will be absorbed when = \frac{2}{252.8}\times 82.1=0.649mol of methane gas is produced.

Now, calculating the mass of methane gas from equation 1, we get:

Molar mass of methane gas = 16 g/mol

Moles of methane gas = 0.649 moles

Putting values in equation 1, we get:

0.649mol=\frac{\text{Mass of methane gas}}{16g/mol}\\\\\text{Mass of methane}=10.384g

Hence, the mass of methane gas produced will be 10.384 g.

7 0
3 years ago
A 25 mL sample of 0.100 M HNO3 completely reacts with NaOH according to this equation:
Anastasy [175]
It is a good thing that you already have answered the first question. Now, moving on to the second question, there exist an equation for the neutralization of acid by a base that is shown below,
                                          M₁V₁ = M₂V₂
Now, all the variables in the equation are given except for our unknown which is the V₂. Substituting the known values from the given above,
                                       (0.1 M)(25 mL) = (0.05 M)(V₂)
The value of V₂ from the equation above is 50 mL. Therefore, 50 mL of 0.05 M NaOH solution will be needed to completely react with HNO3. 
6 0
3 years ago
Read 2 more answers
Other questions:
  • Where is desertification likely to occur?
    14·2 answers
  • Which element has the greatest density at STP? Ba, Be, Mg, or Ra?
    15·2 answers
  • What is the oxidation number of phosphorus (P) in phosphoric acid (H3PO4)?
    14·1 answer
  • Acidic solutions contain high concentrations of
    8·1 answer
  • If an object has a mass of 180 g and a density of 6 g/cm^3, what is the volume of the object?
    6·1 answer
  • De acuerdo con la Ley de la Conservación de la Materia postulada por Lavoisier, ¿cuál ecuación química está balanceada? A C2H5OH
    11·1 answer
  • Which of the following changes in the state of a substance results in an increase in the entropy?
    14·2 answers
  • Fr33 points ;p have a good day everyone
    8·1 answer
  • The Formation Of Lithium Iodide
    8·1 answer
  • The [-oh) in a sample of egg whites is 6.3 x 10-7 m. what is the [h3o+] in these<br>egg whites?
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!