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igomit [66]
3 years ago
9

How many total atoms are there in 69.1 g of ammonia (NH3)?​

Chemistry
1 answer:
lozanna [386]3 years ago
5 0

Answer:

answers is - 3.568

I think this correct answer

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Which of the following is the electron configuration of an excited atom that is likely to emit a quantum of energy?
Soloha48 [4]

Answer: 1s2 2s2 2p6 3s1 3p1

Explanation:

Excitation of an electron is an elevation in energy level of the valence electron above the ground state electron.

When an electron gains energy, usually the outermost electron it moves from a orbital of lower energy to a orbital of higher energy, the element is in an excited state.

The electron configuration of ground state of magnesium is 1s2 2s2 2p6 3s1 3p2, when it gains energy the electronic configuration is 1s2 2s2 2p6 3s1 3p1 the excited state of Magnesium this is because the last electron moves from the 3S orbital to a higher energy orbital 3P

7 0
3 years ago
A piece of balsa wood has a mass of 15.196 g and a volume of 0.1266 L. What is the density in g/mL?
Nataliya [291]
Density = mass / volume

Since the answer must be in g/ml
Convert volume to ml
0.1266 x 1000 = 126.6 ml

15.196 / 126.6

= 0.126 g/ml
4 0
3 years ago
02 (s) + Pb(s) — PbO2(s) find the reduced and oxidized reactants
Arlecino [84]

Answer:

Oxygen is oxidizing gent and itself get reduced while lead is reducing agent and itself get oxidize.

Explanation:

Chemical  equation with oxidation state:

O⁰₂(s)  +  Pb⁰ (s)    →  Pb⁺⁴O₂⁻²(s)

Oxidizing agent:

Oxidizing agents, oxidize the other substance and itself get reduced. They can be identify by just looking the oxidation state. If oxidation state is decreased on the right side it means substance gain the electron and get reduced.

Reducing agent:

Reducing agents, reduce the other substance and itself get oxidize. They can be identify by just looking the oxidation state. If oxidation state is increased on the right side it means substance lose the electron and oxidation state increased.

In given chemical equation, oxygen and lead were in neutral form they react and form lead dioxide. In this product oxygen is oxidizing gent and itself get reduced and oxidation state change from 0 to -2 while lead is reducing agent, itself get oxidize and oxidation state change from o to +4.

7 0
3 years ago
How many moles of br2(l) (mm = 159.80 g/mol) are in 13.9 ml of liquid bromine? the density of br2(l) is 3.12 g/ml?
diamong [38]

Answer:

             Moles  =  0.271 mol

Solution:

Step 1: Calculate Mass of Br₂ as;

                               Density  =  Mass  ÷  Volume

Solving for Mass,

                               Mass  =  Density  ×  Volume

Putting values,

                               Mass  =  3.12 g.mL⁻¹  ×  13.9 mL

                               Mass  =  43.36 g

Step 2: Calculate Moles of Br₂ as;

                               Moles  =  Mass  ÷  M.Mass

Putting values,

                               Moles  =  43.36 g ÷  159.80 g.mol⁻¹

                              Moles  =  0.271 mol

7 0
3 years ago
How do unbalanced forces affect its motion when the object is at rest?
Eddi Din [679]
<span>An unbalanced force acting on a body at rest will change the motion of the body. The of motion is measured by its momentum.</span>
4 0
3 years ago
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