Gas occupies 30 Liters at 2.0 atm pressure and 27° Celsius. How many moles of gas are present

Answers

Answer 1

Answer: Your answer to this question is 2.44 mol.

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"Henry mixed salt and water together in a cup until he observed a clear solution. He measured the mass of the solution. Then he placed the cup outside for several sunny days during the summer. After a week, he observed that only solid salt remained in the cup and the mass had decreased. Henry concluded that a physical and chemical change occurred in this investigation."Which statements correctly defend or dispute his conclusion?A.)He is correct. Dissolving salt in water is a physical change, but evaporating the water is a chemical change. Formation of a solid is evidence that a chemical change occurred.B.)He is correct. Evaporation is a physical change, but dissolving salt in water is a chemical change. The change in mass is evidence that a chemical change occurred.C.)He is incorrect. Dissolving salt in water and evaporation of the water are both physical changes. The reappearance of salt is evidence that the change was reversible by a physical change, so it could not be a chemical change.D.)He is incorrect. Dissolving salt in water and evaporation of the water are both chemical changes. The reappearance of salt is evidence that the change was reversible by a chemical change, so it could not be a physical change.

Which element has the greatest electronegativity?a. Chlorine
b. Oxygen
c. Sulfur
d. Phosphorus
e. Fluorine

Answers

Fluorine has the highest. Fluorine's electronegativity is 4.0

What is a chemical entity that forms a complex ion around a central atom?

Answers

A coordination complex consists of a central atom or Jon, which usually metallic and is called the coordination centre, and a surrounding array of bound molecules or ions, that are in turn known as ligand or complexing agents

What is the #1 or main component of the earths ancient atmosphere?

Answers

I am pretty sure it was composed of mostly CO₂.

WILL GIVE BRAINLEST!!Question 5
Coastal flooding occurs when_

A. Rocks or debris block rivers causing them to overflow

B. Severe weather occurs causing large waves to hit the coast

C. Huge amounts of snow and ice melt due to sudden temperature variations

D. Colossal amounts of rain fall in a short period of time

Answers

Coastal flooding occurs when normally dry, low-lying land is flooded by seawater.[1] The extent of coastal flooding is a function of the elevation inland flood waters penetrate which is controlled by the topography of the coastal land exposed to flooding.The seawater can flood the land via from several different paths:

If you make a solution that has a H+ concentration of 0.075, whatwill the pH of the solution be?

Answers

Answer:

1.125

Explanation:

pH = -log[H+]

pH = -log(0.075)

pH = 1.125

What type of oxygen balance does trinitrotoluene (TNT, C7H5N3O6) have?a. Negative
b. Zero
c. No right choice.

Answers

a. Negative

Explanation:

We have to look at its oxidation (burning, explosion) of TNT:

4 C₇H₅N₃O₆ + 21 O₂ → 28 CO₂ + 10 H₂O + 6 N₂ + heat

So trinitrotoluene need more oxygen atoms that is have to be fully oxidized so the oxygen balance will be negative.

An empirical formula with which you calculate the oxygen balance percent (OB %) is:

OB % = (-1600 / molecular wight) × [2X + (Y/2) + M - Z)

were

X = number of carbon atoms

Y = number of hydrogen atoms

M = number of metal atoms

Z = number of oxygen atoms

For TNT:

OB % = (-1600 / 227.13) × [2×7 + (5/2) + 0 - 6)

OB % = -73.97 %

So the oxygen balance percent is negative.

Learn more about:

oxidation of TNT

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