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3 years ago

How many lone pairs are around the central atom in the Lewis formula for the

Chemistry

1 answer:

Butoxors [25]3 years ago

6 0

Answer:

Zero Lone Pairs

Explanation:

Hydrogen Sulfate is made from Sulfuric acid. It is an ion and contains a negative charge on one of its oxygen atoms. The central atom of this ion is sulfur atom.

The lewis structure of hydrogen sulfate is attached below. It can be seen from the structure that the sulfur is carrying no lone pair of electrons as that carried by oxygen atoms. The sulfur atom is making four single or multiple bonds with oxygen atoms. Also, the electron and molecular geometry around sulfur is Tetrahedral.

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A 300-g aluminum cup contains 700 g of water in thermal equilibrium with the cup at 60°C. The combination of cup and water is co

Rus_ich [418]

Answer:

117.3 W is being removed.

Explanation:

The heat removed can be calculated as:

Q = m*c*ΔT

Where m is the mass, c is the specific heat and ΔT is the temperature variation. Because there're two components:

Q = mwater*cwater*ΔT + maluminum*caluminum*ΔT

Q = (mwater*cwater + maluminum*caluminum)*ΔT

Searching in a thermodynamic table:

cwater = 4.184 J/g°C

caluminium = 0.9 J/g°C

In 1 minute, the temperature decreases 2.2°C, so ΔT = -2.2°C

Q = (700*4.184 + 300*0.9) * (-2.2)

Q = -7037.36 J

The rate of energy is the potency (P), which is the heat divided by the time. So, for 1 minute (60 s):

P = -7037.36/60

P = -117.3 J/s

P = -117.3 W

The minus signal indicates that the energy is being removed.

3 0

3 years ago

Two atoms with different numbers of protons are what?

Gnom [1K]

Answer:

c) two different elements

Explanation:

A periodic table can be defined as the standard arrangement of chemical elements by atomic number, electronic configuration and chemical properties in a tabular form.

Generally, a proper representation of the mass number and atomic number of chemical elements is key and very important in chemistry.

Furthermore, as a rule, it should be noted that the mass number (nucleon number) is always larger than the atomic number(number of proton).

In the periodic table, all chemical elements are identified based on number of protons because it represents the atomic number.

This ultimately implies that, numbers of protons (atomic numbers) is used to differentiate an atom of one chemical element from the atom of another chemical element.

Hence, two atoms with different numbers of protons are two different elements.

For example, Hydrogen has one proton while Oxygen has 8 protons.

6 0

2 years ago

Provide a structure for the compound with molecular formula C9H12 and with the following spectroscopic data.1H NMR: 1.2δ (double

saveliy_v [14]

Answer:

The structure analysis says the compound must be Cumene or isopropylbenzene

Explanation:

Degree of unsaturation or double bond equivalent

D.B.E = $C-\frac{H}{2}+\frac{N}{2}+1$

= $9-\frac{12}{2}+\frac{0}{2}+1$

= 4

¹H NMR data analysis

(i) 1.2δ (doublet, I = 6H) two CH₃ are equivalents and the multiplicity says the neighboring carbon have one hydrogen.

(ii) 3.0δ (septet, I = 1H), one CH and the multiplicity says the neighboring carbon have six hydrogens.

(iii) 7.1δ (multiplet, I = 5H) , means

and the sturcture of the compound is

3 0

3 years ago

How many moles are in 56.0g of N2

ioda

Answer:

2 mol

Explanation:

v= m/M

M(N2) = 28g/mol

v(N2) = 56/28 = 2 mol

8 0

2 years ago

Two tanks (tank A and tank B) of gas are connected by a closed valve. Tank A is 5 liters and contains O2 gas at a pressure of 24

Inessa [10]

Answer:

15 atm

Explanation:

Tank A is V₁ = 5 liters and contains O₂ gas at a pressure (P₁) of 24 atm. When it is connected to tank B, the total volume V₂ is 5 L + 3 L = 8 L. We can calculate the final pressure (P₂) of O₂ using Boyle's law (assuming ideal behavior and constant temperature).

$P_{1}.V_{1}=P_{2}.V_{2}\\P_{2}=\frac{P_{1}.V_{1}}{V_{2}} =\frac{24atm.5L}{8L} =15atm$

The pressure of O₂ is independent of the pressure of N₂.

3 0

3 years ago

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