Answer:
1. 1568 J
2. 0 J
3. 1176 J
Explanation:
PE = mgh
(PE = Potential Energy) = (m = mass)(g = gravitational force which is 9.8)(h = height)
1. (3)(9.8)(20) = 1568 J
2. PE = (3)(9.8)(0) = 0 J
3. (5)(9.8)(24) = 1176 J
Answer: To solve this question, we need to use the Avogadro's Number, which is a constant first discovered by Amadeo Avogadro, an Italian scientist. He discovered that in a mole of a substance, there are 6,02*10²³ molecules. Using this relationship, we apply the following conversion factor:
So, 8,50 * 10²⁴ molecules of Na₂SO₃ represent 14,12 moles of Na₂SO₃
Explanation:
Mass of each silver coin = 5.67 g
Molar mass of silver = 107.87 g/mol
Calculating the moles of silver from given mass and molar mass of silver:
Calculating the atoms of silver in 0.05260 mol using the conversion factor, :
Therefore, atoms of silver are present in each coin.
<span>The elements for which the neutral atom has a valence electron configuration of .
are those whose valence electron shell has 2 + 6 = 8 electrons.
Those are the noble gases, except helium (He).
Here is the list of the noble gases and the configuration of their valence electron configuration:
He:
Ne
Ar
Kr
Xe
Rn
Answer: Ne, Ar, Kr, Xe and Rn</span>