Moles of ammonium sulfide = 5.80 mol
The formula of ammonium sulfide is (NH₄)₂S
So each molecule of ammonium sulfide has (4 x 2) or 8 atoms of H
One mole of ammonium sulfide has 8 moles of H
5.80 mol of ammonium sulfide has (8 x 5.8) or 46.4 moles of H
As per the definition of Avogadro's number, 1 mole = 6.022 x 10²³ atoms
46.4 moles of H x (6.022 x 10²³ atoms/ 1 mole of H)
= 2.8 x 10²⁵ H atoms
Therefore, 2.8 x 10²⁵ H atoms are in 5.80 mol of ammonium sulfide.
Circumpolar stars
Explanation:
Stars which appears to revolve around the Polaris and do not set or go below the horizon are called circumpolar stars.
In short, this stars circles the pole.
- Circumpolar stars are not found at the equator.
- These stars do not set and they are visible at the north poles.
- The simply stay as the earth spins on its axis.
Learn more:
Stars brainly.com/question/11007330
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Answer:
Fe₂O₃ is the limiting reactant.
7.57 g of MgO are formed.
Explanation:
- 3 Mg + 1 Fe₂O₃ → 2 Fe + 3 MgO
First we <u>convert the given masses of both reactants into moles</u>, using their <em>respective molar masses</em>:
- 15.6 g Mg ÷ 24.305 g/mol = 0.642 mol Mg
- 10.0 g Fe₂O₃ ÷ 159.69 g/mol = 0.0626 mol Fe₂O₃
0.0626 moles of Fe₂O₃ would react completely with (3 * 0.0626 ) 0.188 moles of Mg. As there are more Mg moles than required, Mg is the reactant in excess; thus, <em>Fe₂O₃ is the limiting reactant</em>.
We now <u>calculate how many MgO moles are produced</u>, using the <em>number of moles of the limiting reactant</em>:
- 0.0626 mol Fe₂O₃ *
= 0.188 mol MgO
Finally we <u>convert moles of MgO into grams</u>:
- 0.188 mol MgO * 40.3 g/mol = 7.57 g
Explanation:
Atomic number means the number of protons an atom holds. Whereas mass number equals (number of protons + number of neutrons).
The given figure shows that there are 9 neutrons and 8 protons.
Therefore,
mass number of the atom = number of protons + number of neutrons
= 8 + 9
= 17
Hence, mass number of the atom is 17 and atomic number of the atom is 8.
Answer:
See explanation
Explanation:
2. Newton's law of universal gravitation states that every object in this universe is attracted to every other object, based on their mass and distance from each other. In the case of the Earth and Moon, for instance, since they are both very massive objects separated by a large distance, they have a gravitational pull strong enough to stay together but not strong enough to smash into each other.
3. Newton's first law of motion states that an object in motion will stay in motion, and that an object at rest will stay at rest unless acted upon by an outside force. If the court is flat and mostly frictionless, and the ball is already rolling with a certain velocity, then there is no reason for that ball to stop rolling from the point of view of this law.
4. Greater mass increases the attraction of gravity proportionally, while greater distance decreases the attraction exponentially. Therefore, a larger distance makes the force of gravity weaker than a mass expanding at a proportionally fast rate.
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