Answer:
222.2 grams of CaCl2 in 2 moles
Explanation:
Mole=given mass/gram mass formula
2moles=x/Gram Mass Formula
(Gram Mass Formula of CaCl2):
Ca=40.1
Cl= 35.5 x 2= 71
-----------------------
GFM=111.1
2 moles = x/111.1 g
x=222.2
for an electron to move from an energy level that was close to the nucleus to an energy level that is far from the nucleus would it need to gain or lose energy ?
Answer:
it would need to lose energy
Explanation:
I don't really have an explanation
As the electrons gets closer to the nucleus, by the electrostatic force of attraction electrons are tightly bound to the nucleus. To move the inner electron to outer shell, high energy have to applied to weaken the nuclear force.
What is nuclear force?Nuclear force is the force by which the nucleon are bind in the nucleus and electrons are attracted towards the nucleus. The positively charged protons inside the nucleus electrostatically attracts the negatively charged electrons.
The minimum amount of energy required to remove an electron from the valence shell by overcoming the nuclear force is called ionization energy.
To bring an electron which is closer to the nucleus to the outer shell needs much energy to reduce the nuclear attractive pull. The energy need to gain.
Find more on ionization energy:
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Is magnesium reacting with oxygen an exothermic reaction?
Answer:
is it a yes or no question
if it is yes
Explanation:
Natural Causes of Climate Change:
Pick one cause of natural climate change. Explain what it is and how
it causes dimate change. What is the effect of the climate change?
Helpp plzzz
Answer:
cause of climate change: The earth's climate is affected and changed through a lot of natural causes like volcanic eruptions.
how it causes change: Volcanoes can be extremely dangerous to earth because it can impact climate change. During major explosive eruptions huge amounts of volcanic gas, aerosol droplets, and ash are injected into the stratosphere.
what is the effect of the change: Major eruptions alter the Earth's radiative balance because volcanic aerosol clouds absorb terrestrial radiation, and scatter a significant amount of the incoming solar radiation, an effect known as "radiative forcing" that can last from two to three years following a volcanic eruption.
i hope you get it correct!! <3 can i plz get a brainlest!
I need help working these
Answer:
1) 7.80 X 10^22[tex]\frac{1}{6.02*10^{23} }[/tex] = .13
2) 5.6 [tex]\frac{6.02*10^{23} }{1}[/tex] = 3.4 X 10^24
3)3.81 [tex]\frac{1}{74.55}[/tex] X [tex]\frac{6.02*10^{23} }{1}[/tex] = 3.08 X 10^22
4) 399.91 [tex]\frac{4.05*10^{23} }{6.02*10^{23} }[/tex] = 269
5)4.32 [tex]\frac{1}{18.01}[/tex] X [tex]\frac{22.4}{1}[/tex] = 5.37
Explanation:
For 2 the correct answer is 3.4 instead of 3.2. The 3.4 is rounded from 3.37. Sadly I couldn't figure out the bonus.
How many molecules are equal to 10.35 g of pyridine?
Answer:
0.78× 10 ²³ molecules
Explanation:
Given data:
Mass of pyridine = 10.35 g
Number of molecules = ?
Solution:
Number of moles of pyridine:
Number of moles = mass/molar mass
Number of moles = 10.35 g/ 79.1 g/mol
Number of moles = 0.13 mol
Number of molecules;
1 mole contain 6.022× 10 ²³ molecules
0.13 mol × 6.022× 10 ²³ molecules / 1mol
0.78× 10 ²³ molecules
PLEASE ANSWER, I WILL GIVE BRAINLIEST AND THANKS!
48g of magnesium and 32g of oxygen react to form 80g of magnesium oxide. 2Mg + O2 --> 2MgO What mass of oxygen is needed to make 20g of MgO?
Answer:
8g
Explanation:
1mole of oxygen -->2moles MgO
32g --> 80g
?g --> 20g
(20x32)÷80
= 8g oxygen
Answer:
Mass of oxygen needed = 8 g
Explanation:
Given data:
Mass of oxygen needed = ?
Mass of MgO formed = 20 g
Solution:
Chemical equation:
2Mg + O₂ → 2MgO
Number of moles of MgO:
Number of moles = mass/molar mass
Number of moles = 20 g/ 40 g/mol
Number of moles = 0.5 mol
Now we will compare the moles of MgO and O₂:
MgO : O₂
2 : 1
0.5 : 1/2×0.5 = 0.25 mol
Mass of oxygen needed:
Mass = number of moles × molar mass
Mass = 0.25 mol × 32 g/mol
Mass = 8 g
If the [OH-] of a solution is 2.7 x 10-4 mol/L the pOH of the solution is
Answer:
14/2.1 thats just what i do
Explanation:
If the [OH⁻] of a solution is 2.7 × 10⁻⁴ mol/L the pOH of the solution is 3.569.
What is pH ?pH is used to measure whether the substance is acidic, basic or neutral and the range is 0-14.
How to find the pOH of the solution ?To calculate the pOH it is expressed as:
pOH = - log[OH⁻]
= - log[2.7 × 10⁻⁴]
= - [log 2.7 + log 10⁻⁴] [log a × b = log + log b]
= - [log 2.7 - 4 log 10] [log aˣ = x log a]
= - [log 2.7 - 4 × 1] [log 10 = 1]
= - [log 2.7 - 4]
= - [0.431 - 4]
= - [-3.569]
= 3.569
Thus, from above conclusion we can say that If the [OH⁻] of a solution is 2.7 × 10⁻⁴ mol/L the pOH of the solution is 3.569.
Learn more about the pH here: https://brainly.com/question/24595796
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The number 6.02 x 1023 is called...
i need help what is the name for 6.02 x10^23
How many grams of KClO3 will dissolve in 300g of water at 50°C?
Answer:
50 g
Explanation:
Please brainiest
If a sample of gas of valume 605 mL and temperature of 39 OC, has 0,00803 moles. What is it’s pressure?
Answer:
The pressure of the gas is 0.35 atm.
Explanation:
We can find the pressure of the gas by using the Ideal Gas Law:
[tex] P = \frac{nRT}{V} [/tex]
Where:
V: is the volume = 605 mL = 0.605 L
n: is the number of moles = 0.00803 moles
T: is the temperature = 39 °C = 312 K
R: is the gas constant = 0.082 L*atm/(K*mol)
Hence, the pressure is:
[tex] P = \frac{0.0083 moles*0.082 L*atm/(K*mol)*312 K}{0.605 L} = 0.35 atm [/tex]
Therefore, the pressure of the gas is 0.35 atm.
I hope it helps you!
PLS HELP THIS IS DUE TODAY!!
Answer:
I think it would be Yellow