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Doss [256]
3 years ago
6

If an element’s atomic number is 15, how many electrons must it have in order to be neutral?

Chemistry
1 answer:
Alinara [238K]3 years ago
6 0

Answer:

15

Explanation:

atomic number is the same as protons so 15 protons and 15 electrons would be neutral

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A 10.0g sample of H2O(l) at 23.0degrees C absorbs 209 joules of heat. What is the final temp of the H2O(l) sample? Explain.
IRISSAK [1]

Answer:

Final temperature = 28.0 degrees C.

Explanation:

heat absorbed = mass * specific heat * rise in temperature.

The specific heat of water is 4.186 J /g/C so we have the equation

209 =  10 * 4.186 * x   where x is the temperature increase

41.86x = 209

= 5 degrees C.

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3 years ago
Which of the following is an example of an exothermic reaction?
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D but I’m not to sure about it
4 0
3 years ago
How much volume will 8.8 moles of gas fill at 0.12 atm at 56*C
Neporo4naja [7]

Answer:

2000 L

General Formulas and Concepts:

<u>Atomic Structure</u>

  • Moles
  • Temperature Conversion: K = °C + 273.15

<u>Gas Laws</u>

Ideal Gas Law: PV = nRT

  • P is pressure
  • V is volume (in L)
  • n is number of moles
  • R is gas constant
  • T is temperature (in K)

Explanation:

<u>Step 1: Define</u>

[Given] 8.8 moles gas

[Given] 0.12 atm

[Given] 56 °C = 329.15 K

<u>Step 2: Solve for </u><em><u>V</u></em>

  1. Substitute in variables [Ideal Gas Law Formula]:                                           \displaystyle (0.12 \ atm)V = (8.8 \ mol)(0.0821 \ \frac{L \cdot atm}{mol \cdot K})(329.15 \ K)
  2. Isolate <em>V</em>:                                                                                                           \displaystyle V = \frac{(8.8 \ mol)(0.0821 \ \frac{L \cdot atm}{mol \cdot K})(329.15 \ K)}{(0.12 \ atm)}
  3. Multiply/Divide [Cancel out units]:                                                                   \displaystyle V = 1981.7 \ L

<u>Step 3: Check</u>

<em>Follow sig fig rules and round. We are given 2 sig figs.</em>

1981.7 L ≈ 2000 L

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