CHEMISTRY HIGH SCHOOL

If 2.27 moles of bromine react with excess phosphorus, how many moles of phosphorus tribromide will be produced

Answers

Answer 1
Answer:

Answer:

The answer to your question is 1.51 moles of PBr₃

Explanation:

Data

moles of Br = 2.27

moles of PBr₃ = x

Balanced chemical reaction

                   2P   +   3Br₂  ⇒   2PBr₃

             Reactant      Element     Products

                   2                  P                 2

                   6                  Br                6

-Use proportions to find the answer

              3 moles of Br₂ ------------------  2 moles of PBr₃

         2.27 moles of Br₂ ------------------  x

               x = (2.27 x 2) / 3

               x = 4.54 / 3

              x = 1.51 moles
Answer 2
Answer:

Answer:Identify one disadvantage to each of the following models of electron configuration:

Dot structures

Arrow and line diagrams

Written electron configurations

Explanation:

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Write this number showing three significant figures. Remember to round. 10,411

Answers

10,400 Is the answer

The process of breaking down of a chemical compound into its elements by chemical means is called: a) Analysis b) Synthesis c) Cracking d) None of the above

Answers

Answer:analysis

Explanation:

The reaction between NaOH(aq) and H2SO4(aq) was studied in a constant-pressure calorimeter: 100.0 mL portions of 1.00 M aqueous NaOH and H2SO4, each at 24.0C, were mixed. The volume of the mixture was 200.0 mL. The maximum temperature achieved was 30.6C. Neglect the heat capacity of the calorimeter and the thermometer, and assume that the solution of products has a density of 1.00 g/mL and a specific heat capacity of 4.18 J/(g·K). Calculate H, the heat (enthalpy) of reaction, in kJ per mole of acid. (Hint: You may not have the equivalent amounts of NaOH and H2SO4 in this experiment.)

Answers

Answer:

110,4 kJ / mole of acid

Explanation:

The reaction of NaOH with H₂SO₄ is:

2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O

Moles of NaOH and H₂SO₄ are:

0,1000L×1,00M = 0,100 moles of NaOH and 0,100 moles of H₂SO₄. As 2 moles of NaOH reacts with 1 mole of  H₂SO₄, moles of acid that react are 0,100/2 = 0,0500moles of acid.

The produced heat is:

Q = C×m×ΔT

Where C is specific heat capacity (4,18J/gK)

m is mass: 200,0mL×(1,00g/mL) = 200g

ΔT is change in temperature: 30,6°C - 24,0°C = 6,6°C = 6,6K

Thus, Q is:

Q = 4,18J/gK×200g×6,6K

Q = 5518J = 5,52kJ

ΔH in kJ per mole of acid:

5,52kJ / 0,0500moles of acid = 110,4 kJ / mole of acid

I hope it helps!

How do you make liquid nitrogen icecream

Answers

Answer:

When it comes to ice cream, there are two big advantages to using liquid nitrogen over an electric machine or an old-timey hand-cranked job. First, it’s faster. Second, because it’s faster, there’s less likelihood that your cold confection will develop those pesky ice crystals that form when the ice cream freezes too slowly. To recap: better dessert, in your mouth sooner. What’s not to love?

Make mine the brainliest

Explanation:
Add any other liquid flavorings you might want. Put on your gloves and goggles. Pour a small amount of liquid nitrogen directly into the bowl with the ice cream ingredients. Continue to stir the ice cream, while slowly adding more liquid nitrogen.

Nuclear fusion in the sun involves hydrogen (H) atoms combining to form helium (He). A student claims that since the atmosphere contains hydrogen, any fusion reaction on Earth would result in an uncontrolled chain reaction. What is wrong with the student's reasoning?The hydrogen in air is not densely packed enough for an uncontrolled chain reaction.
Uncontrolled chain reactions can only happen during nuclear fission.
It is impossible to cause a fusion reaction to happen anywhere outside of the sun.
We are safe because there is no radioactive hydrogen in the air.

Answers

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Uncontrolled chain reactions can only happen during nuclear fission is what is wrong with the student's reasoning.

What is Nuclear fission?

This is the process in which the nuclei of an atomsplit into two or more nuclei with large amount of heat being involved.

Nuclear fusion in the sun involves hydrogen atoms combining to form helium and the student claims that since the atmosphere contains hydrogen, any fusion reaction on Earth would result in an uncontrolled chain reaction which is wrong as it occurs only during fission.

Read more about Nuclear fission here brainly.com/question/3992688

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Copper, silver, and nickel are all classified as

Answers

Answer: currency

Explanation:
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