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aev [14]
3 years ago
14

Except for helium, all the elements in the last column of the periodic table have

Chemistry
1 answer:
lorasvet [3.4K]3 years ago
4 0

Answer:

O

Explanation:

they have O valence electrons

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In a solution the hydroxide ion concentration is 1 ✕ 10-12 M. What is the pH of the solution?
Deffense [45]

Answer:

pH = 2 and pOH = 12

Explanation:

Given [OH⁻] = 1 x 10⁻¹²M

pOH = -log[OH⁻] = -log(1 x 10⁻¹²) = - ( -12 ) = 12

pH + pOH = 14 => pH = 14 - pOH = 14 - 12 = 2

7 0
3 years ago
Two compounds that have the same molecular formula but different structural formulas are
bija089 [108]
This definition would best fit conformational isomers. Two compounds that have different structural formulas, although the number and types of atoms are the same.
6 0
4 years ago
How much CO2 is produced from the combustion of a tank of propane C3H8? Assume the tank contains 9kgs of propane and the molecul
Zinaida [17]

<u>Answer:</u> The mass of carbon dioxide produced is 26.9 kg

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}      .....(1)

Given mass of propane = 9 kg = 9000 g    (Conversion factor:  1 kg = 1000 g)

Molar mass of propane = 44.1 g/mol

Putting values in equation 1, we get:

\text{Moles of propane}=\frac{9000g}{44.1g/mol}=204.08mol

The chemical equation for the combustion of propane follows:

C_3H_8+5O_2\rightarrow 3CO2+4H_2O

By Stoichiometry of the reaction:

1 mole of propane produces 3 moles of carbon dioxide.

So, 204.08 moles of propane will produce = \frac{3}{1}\times 204.08=612.24mol of carbon dioxide.

Now, calculating the mass of carbon dioxide by using equation 1, we get:

Molar mass of carbon dioxide = 44.01 g/mol

Moles of carbon dioxide = 612.24 moles

Putting values in equation 1, we get:

612.24mol=\frac{\text{Mass of carbon dioxide}}{44.01g/mol}\\\\\text{Mass of carbon dioxide}=(612.24mol\times 44.01g/mol)=26944.7g=26.9kg

Hence, the mass of carbon dioxide produced is 26.9 kg

3 0
3 years ago
Which basic postulates of Dalton's atomic theory are modified by the modern atomic theory​
Kisachek [45]

Answer:

Dalton's atomic theory has been modified as

Explanation:

Atoms of same element may not have same atomic mass. For example, some atoms of chlorine have atomic mass 35 amu while others have atomic mass 37 amu. Such atoms of same element having different atomic masses are called isotopes

6 0
3 years ago
Read 2 more answers
Which law is described by saying that when the pressure of a gas in a sealed container is cut in half, the gas will double in vo
Anon25 [30]

I believe it would be Boyle's Law

(P [is proportional to] 1/V)

P being pressure

V being volume

4 0
3 years ago
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