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pantera1 [17]
3 years ago
8

What is a pure substance that cannot be chemically broken down into simpler substances?

Chemistry
1 answer:
SCORPION-xisa [38]3 years ago
3 0
I believe it is A compound
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Calculate the pressure of O2 (in atm) over a sample of NiO at 25.00°C if ΔG o = 212 kJ/mol for the reaction. For this calculatio
Pepsi [2]
Answer : Given data ;
Δ G° = 212 KJ/molTemperature is = 25+273 = 298 KAnd gas constant R = 0.008314 KJ/mol

The reaction is NiO(s) ⇌ Ni(s) + \frac{1}{2}  O_{2 _{(g)} We can find out the pressure on oxygen by using the equation of gibb's free energy with remainder quotient which is,                                      ΔG = ΔG° +RT lnQ
when at equilibrium Q = K, here K is equilibrim constant, and ΔG becomes 0;
so we get, 0 = ΔG° + RT ln K
on rearranging we get, ln K = ΔG° / (RT)
ln K = 212 / (0.00831 X 298) = 85.6  
Here, now K =  = 1.51 X 10^{37}
When we get K = 1.51 X 10^{37}

But, K = (PO_{2})^ \frac{1}{2}So, (1.51 X 10^{37}) ^ \frac{1}{2} = 3.87 X 10^{18}
Hence, the pressure of oxygen will be = 3.87 X 10^{18} Pa

Now, Pa to atm conversion will be 3.756 X 
10^{13} atm
7 0
3 years ago
Chlorine gas can be prepared in the laboratory by the reaction of hydrochloric acid with manganese(IV) oxide. 4 HCl ( aq ) + MnO
eduard

Answer:

HCl is the limiting reactant.

20.2 grams = theoretical yield Cl2

actual yield = 16.75 grams Cl2

Explanation:

Step 1: Data given

Mass of MnO2 = 43.5 grams

Molar mass MnO2 = 86.94 g/mol

Mass of HCl = 41.5 grams

Molar mass HCl = 36.46 g/mol

Step 2: The balanced equation

4HCl(aq)+MnO2(s)⟶MnCl2(aq)+2H2O(l)+Cl2(g)

Step 3: Calculate moles

Moles = mass / molar mass

Moles MnO2 = 43.5 grams / 86.94 g/mol

Moles MnO2 =  0.500 moles

Moles HCl = 41.5 grams / 36.46 g/mol

Moles HCl = 1.14 moles

Step 4: Calculate the limiting reactant

For 4 moles HCl we need 1 mol MnO2 to produce 1 mol MnCl2, 2 moles H2O and 1 mol Cl2

HCl is the limiting reactant. I will completely be consumed (1.14 moles).

MnO2 is in excess. There will react 1.14 /4 = 0.285 moles

There will remain 0.500 - 0.285 = 0.215 moles MnO2

Step 5: Calculate moles Cl2

For 4 moles HCl we need 1 mol MnO2 to produce 1 mol MnCl2, 2 moles H2O and 1 mol Cl2

For 1.14 moles HCl we'll have 1.14/4 = 0.285 moles Cl2

Step 6: Calculate mass Cl2

Mass Cl2 = moles Cl2 * molar mass Cl2

Mass Cl2 = 0.285 moles * 70.9 g/mol

Mass Cl2 = 20.2 grams = theoretical yield

Step 7: Calculate actual yield

% yield = (actual yield / theoretical yield) *100%

0.829 = actual yield / 20.2 grams

actual yield = 0.829 * 20.2 grams

actual yield = 16.75 grams Cl2

6 0
3 years ago
How many molecules of oxygen are produced when a sample of 38.9 g of water is decomposed by electricity?
statuscvo [17]

Answer:

A) 6.5\times 10^{23}\ \text{molecules}

Explanation:

m = Mass of water = 38.9

M = Molar mass of water = 18 g/mol

N_A = Avogadro's number = 6.022\times 10^{23}\ \text{mol}^{-1}

The reaction of electrolysis would be

2H_2O(l)\rightarrow 2H_2(g)+O_2(g)

Number of moles of H_2O

n=\dfrac{m}{M}\\\Rightarrow n=\dfrac{38.9}{18}\ \text{mol}

From the reaction it can be seen that 2 moles of H_2O gives 1 mole of O_2

So, number of moles of O_2 produced is

\dfrac{38.9}{18}\times \dfrac{1}{2}=1.081\ \text{mol}

Number of molecules

1.081N_A=1.081\times 6.022\times 10^{23}\\ =6.5\times 10^{23}

So, 6.5\times 10^{23}\ \text{molecules} of oxygen is produced.

8 0
2 years ago
The percent yield for the reaction in which 15.6g of aluminum hydroxide is reacted in excess hydrogen chloride gas is 92.5%. Wha
Misha Larkins [42]

Answer:

24.6 g

Explanation:

4 0
3 years ago
How much energy does a 445 nm wave of light have? (The speed of light in a
Dahasolnce [82]

Answer:

A

Explanation:

To calculate questions like this, you need to make use of the equation below:

E = hν

E is the energy, h is Planck's constant, and ν is the frequency.

Also, another important formula you need for this question is the following:

ν = c / λ

ν is the frequency, c is the speed of light, and λ is the wavelength.

Therefore, E = hν = hc/λ.

Also remember to convert nm wavelength to meters.

To answer the question, E = hc/λ = ((6.626*10^-34 J•s)(3*10^8 m/s))/(4.45*10-7 m) = 4.42 • 10^-19 J = A

8 0
2 years ago
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