What is the percent composition by mass of nitrogen in NH4NO3 (gram-formula mass = 80.0 grams/mole)?(1) 17.5% (3) 52.5%
(2) 35.0% (4) 60.0%

Answers

Answer 1

Answer:

Answer:

The correct option is (2) 35.0%

Explanation:

If we want to calculate the percent composition by mass of nitrogen in NH4NO3 we first need to calculate the mass of nitrogen in one mole of NH4NO3.

Because of the molecular form of NH4NO3 (it has 2 ''N'') we know that one mole of NH4NO3 contains 2 moles of N.

The molar mass of N (nitrogen) is $14.0067(g)/(mole)$

This means that 1 mole of N contains 14.0067 grams of N.

Because we have 2 moles of N ⇒ $(2moles).(14.0067(g)/(mole))=28.0134g$

We know that in 1 mole of NH4NO3 we have 2 moles of N(28.0134 g of N).

To calculate the percent composition by mass of nitrogen we need to divide the mass of nitrogen in one mole of NH4NO3 by the mass of one mole of NH4NO3 and then multiply it by 100.

We know that in 1 mole of NH4NO3 there are 80.0 g of NH4NO3 (Because of the molar mass data) ⇒

$((28.0134g)/(80.0g)).100=35.016$ % ≅ 35.0%

We find that the percent composition by mass of nitrogen in NH4NO3 is 35.0%

We conclude that the correct option is (2) 35.0%

Answer 2

Answer: gram-formula=80.0grams/mole will be 35.0%

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Reactant A contains 85.1 J of chemical energy. Reactant B contains 87.9 J of chemical energy. Product C contains 38.7 J of chemical energy. If the reaction absorbs 104.3 J of chemical energy as it proceeds, how much chemical energy must product D contain?

Answers

Answer: 238.6 J

Explanation:

1) Chemical energy is indicated as enthalpy

2) Energy balance:

∑ enthalpy of the reactants + energy added = ∑ enthalpy of the products + energy released.

3) ∑ enthalpy of the reactants = 85.1 J + 87.9 J = 173 J

4) energy added = 104.3 J

5) ∑ enthalpy of the products = 38.7 J + D

6) energy released = 0

7) Equation:

173J + 104.3J = 38.7 + D + 0

⇒ D = 173J + 104.3J - 38.7J = 238.6J, which is the chemical energy of the product D.

Answer:238.6 J

Explanation:

Solid samples of the element phosphorus can be white, black, or red in color. The variations in color are due to different(1) atomic masses
(2) molecular structures
(3) ionization energies
(4) nuclear charges

Answers

Answer:

Due to molecular structures.

Explanation:

The different forms of phosphorus (white, black or red) are allotropes of phosphorus.

They differ in molecular structures.

White phosphorus: It has four phosphorus which form a tetrahedral shape.

Black phosphorus : It has orthorhombic structure and due to interlinked six membered rings, it is least reactive.

Red phosphorus: It is formed on heating white phosphorus. It is initially amorphus and turns crystalline on further heating.

Solid samples of the element phosphorus can be white, black, or red in color. The variations in color are due to different Molecular structures.

If a person's gallbladder were removed by surgery, which of the following substances would he have the most difficulty digesting? a. carbohydrates b. nucleic acids c. fats d. proteins

Answers

Explanation:

Fats

The gallbladder stores bile ( made in the liver) which is secreted into the digestive tract to aid in the digestion of dietary fats.

The depictions of ionic compounds do not show distinct compound units but rather a collection of ions in the ratio given by the formula. Explain how the drawing of NaCl both illustrates that the compound exists as a large collection of ions and that the ratio of sodium ions to chloride ions is 1-to-1 as indicated by the formula NaCl.

Answers

Answer:

The ionic compound NaCl has a Face Centered Cubic unit cell

The site for atoms are Face, center and Edges corner.

Effective number of atoms

Na+

1centers + 12edges x $(1)/(4)$ = 4 Na+

Cl-

6face x $(1)/(2)$ + $(1)/(8)$ x8 corners = 4Cl-

This is just one unit cell effective atom, there are thousand's of such unit cells are combined to form one such structure of NaCl. The real formula of NaCl is Na4Cl4 but for simplicity we use empirical formula that is NaCl.

Why is it incorrect to balance a chemical equation by changing the subscripts?