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Harman [31]
3 years ago
9

According to the following electron structure, how many valence electrons does carbon have? C = 1s22s22p2

Chemistry
2 answers:
8_murik_8 [283]3 years ago
8 0
The anser is 2 hope it helps
masya89 [10]3 years ago
6 0

The answer is 4 valence electrons

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To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an empty 4.6-L bulb, then filled
snow_tiger [21]

Answer:

The chemical formula of the gas is N_2.

Explanation:

The difference between the container with gas and empty container is equal to the mass of the gas.

Let the gas be X_2

Mass of the gas = m

Molar mass of diatomic gas = M

Pressure of the gas = P = 1.80 atm

Volume of the gas = V = 4.6 L

Temperature of the gas= T = 27.0 C = 27.0 + 273 K = 300 K

Moles of diatomic gas = n = \frac{m}{M}

Using ideal gas equation:

PV=nRT

PV=\frac{m}{M}RT

M=\frac{mRT}{PV}=\frac{9.5 grams \times 0.0821 atm L/mol K\times 300 K}{1.80 atm\times 4.6 L}=28.26 g/mol\approx 28 g/mol

Atomic mass of the element X = \frac{28 g/mol}{2}=14 g/mol

The element is nitrogen and the diatomic gas is N_2.

5 0
3 years ago
How is the enthalpy of reaction shown in this potential energy diagram?
Lera25 [3.4K]

Answer:

as the difference of the energy of the reactants and the energy of the products

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3 years ago
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What is the normal pH range of a Base?
Karolina [17]

Answer:

7.35 - 7.45

Explanation:

The pH scale ranges from 0 (strongly acidic) to 14 (strongly basic or alkaline). A pH of 7.0, in the middle of this scale, is neutral. Blood is normally slightly basic, with a normal pH range of about 7.35 to 7.45. Usually, the body maintains the pH of blood close to 7.40.

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Which of the following processes will determine the number of moles in a sample? Dividing the mass of the sample by Avogadro's n
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The answer is: Dividing the number of molecules in the sample by Avogadro's number.

The Avogadro’s number is the number of atoms in 12 grams of the isotope carbon-12 (¹²C).

Na is Avogadro number or Avogadro constant (the number of particles, in this example carbon, that are contained in the amount of substance given by one mole).

The Avogadro number has value 6.022·10²³ 1/mol in the International System of Units; Na = 6.022·10²³ 1/mol.

For example:

N(Ba) = 2.62·10²³; number of atoms of barium.

n(Ba) = N(Ba) ÷ Na.

n(Ba) = 1.3·10²⁴ ÷ 6.022·10²³ 1/mol.

n(Ba) = 2.158 mol; amount of substance of barium.

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