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2 years ago

How many electrons does each atom have? What group is each in?

1 answer:

7 0

In an atom, the electron's spin around the center, also called the nucleus. The electrons like to be in separate shells/orbitals. Shell number one can only hold 2 electrons, shell two can hold 8, and for the first eighteen elements shell, three can hold a maximum of eight electrons. ( This is the answer to both questions!)

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74) A solution is prepared by dissolving 0.60 g of nicotine (a nonelectrolyte) in water to make 12 mL of solution. The osmotic p

dusya [7]

Answer:

molar mass of nicotine will be 162.16g/mol

Explanation:

The mass of nicotine taken = 0.60g

The volume of solution = 12mL

the osmotic pressure of solution = 7.55 atm

Temperature in kelvin =298.15K (25+ 273.15)

The formula which relates osmotic pressure and concentration (moles per L) is:

π = MRT

Where

π = osmotic pressure (unit atm) = 7.55 atm

M = molarity (mol /L)

T= temperature = (K) = 298.15 K

R = gas constant = 0.0821 L atm /mol K

Putting values

$7.55=MX0.0821X298.15$

Therefore

$M=\frac{7.55}{0.0821X298.15}=0.308\frac{mol}{L}$

Molarity is moles of solute dissolve per litre of solution

The volume of solution in litre = 0.012 L

$molarity=\frac{moles}{V}$

$moles=molarityXvolume=0.308X0.012=0.0037mol$

we know that

$moles=\frac{mass}{ymolarmass}$

molar mass = $\frac{mass}{moles}=\frac{0.60}{0.0037}=162.16\frac{g}{mol}$

5 0

3 years ago

there are 2 protons that are 5 cm apart. each proton has the same Elementary charge. what is the charge of each Proton

tresset_1 [31]

Answer:

what are you looking for so that people can help you with it

8 0

2 years ago

A forest ecosystem starts with both Sonoran toads and Wood frogs. What would you expect to happen if the ecosystem becomes more

Gnom [1K]

Answer:

i think that sonoran toads would prosper and wood frogs would disappear

Explanation:

because of the provided information

5 0

2 years ago

Data for CH3COOH(l) + C2H5OH(l) CH3COOC2H5(l) + H2O(l) balance were obtained at 100. The initial concentrations of the reagents

Sphinxa [80]

Answer:

Kc = 3.94

Explanation:

CH₃COOH(g) + C₂H₅OH(g) → CH₃COOC₂H₅(g) + H₂O(g)

Liquids aren't included in the equilibrium constant, but at 100°C, all four compounds are a gas. So the equilibrium equation is:

Kc = [CH₃COOC₂H₅] [H₂O] / ([CH₃COOH] [C₂H₅OH])

Set up an ICE table for each row and calculate the value of Kc. Then average the results. (See picture.)

Kc ≈ (3.919 + 4.012 + 3.902) / 3

Kc ≈ 3.94

3 0

3 years ago

Nitrogen reacts with hydrogen to produce ammonia gas as follows. mc023-1.jpg How many moles of nitrogen would react with excess

anzhelika [568]

The balanced reaction is:

N2 + 3H2 = 2NH3

We are given the amount of the product to be produced.This will be the starting point of our calculations. We use the ideal gas equation to find for the number of moles.

<span>
n = PV / RT = 1.00(.520 L) / (0.08206 atm L/mol K ) 273 K
n= 0.0232 mol NH3

</span>0.0232 mol NH3 (1 mol N2 / 2 mol NH3) = 0.0116 mol N2

<span>Therefore, the correct answer is A.</span>

7 0

2 years ago

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