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rjkz [21]
3 years ago
12

What is more electronegative? O or Br

Chemistry
1 answer:
cluponka [151]3 years ago
8 0

Answer:

O

Explanation:

O = 3.44

Br = 2.96

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How many atoms are present in a sample of Potassium (K) weighing 33.49g?
madam [21]

Answer:

5.158 × 10²³ atoms K

General Formulas and Concepts:

<u>Chemistry - Atomic Structure</u>

  • Reading a Periodic Table
  • Using Dimensional Analysis
  • Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

Explanation:

<u>Step 1: Define</u>

33.49 g K

<u>Step 2: Identify Conversions</u>

Avogadro's Number

Molar Mass of K - 39.10 g/mol

<u>Step 3: Convert</u>

<u />33.49 \ g \ K(\frac{1 \ mol \ K}{39.10 \ g \ K} )(\frac{6.022 \cdot 10^{23} \ atoms \ K}{1 \ mol \ K} ) = 5.15797 × 10²³ atoms K

<u>Step 4: Check</u>

<em>We are given 4 sig figs. Follow sig figs and round.</em>

5.15797 × 10²³ atoms K ≈ 5.158 × 10²³ atoms K

3 0
3 years ago
1) you are building a model plane that needs small block inside to balance its weight. you find that the block material you are
blagie [28]

Answer:

then it will move 1 too 2

right maybe

Explanation:

7 0
3 years ago
Read 2 more answers
On the periodic table, gold has the atomic number 79. This means that
Troyanec [42]

Answer:

it has 79 protons

Explanation:

the atomic number is equal to the number of protons an element has.

3 0
3 years ago
Why does ammonia gas diffuse faster than hydrogen chloride gas?
Yakvenalex [24]
The ammonia gas, having a lower molecular weight than the hydrogen chloride, will diffuse faster and travel a greater length of the tube. Consequently, the white ring of ammonium chloride will form much closer to hydrochloric acid end of the tube. Which in conclusion your answer will be D :)
4 0
3 years ago
2. Lithium-6 is 4% abundant and lithium-7 is 96% abundant. What is the average mass of lithium?
Lisa [10]

Answer:

Average atomic mass = 6.96 amu.

Explanation:

Abundance of Li-6 = 4%

Abundance of Li-7 = 96%

Atomic mass of Li-6 = 6 amu

Atomic mass of Li-7 = 7 amu

Average atomic mass = ?

Solution:

Average atomic mass  = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)  / 100

Average atomic mass  = (4×6)+(96×7) /100

Average atomic mass =  24 + 672 / 100

Average atomic mass = 696 / 100

Average atomic mass = 6.96 amu.

8 0
3 years ago
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