CHEMISTRY HIGH SCHOOL

The gram formula mass of NH4Cl is(1) 22.4 g/mole (3) 53.5 g/mole(2) 28.0 g/mole (4) 95.5 g/mole

Answers

Answer 1
Answer:

Answer: Option (3) is the correct answer.

Explanation:

Gram formula mass or molar mass is the sum of mass of all the individual  atoms present in the compound or formula.

For example, gram formula mass of NH_(4)Cl is calculated as follows.

     NH_(4)Cl = Mass of N + 4 * mass of H + mass of Cl

                            = (14.00 + 4 * 1.00 + 35.45) g/mol

                             = (14.00 + 4.00 + 35.45) g/mol

                             = 53.45 g/mol

                             = 53.5 g/mol (approx)

Thus, we can conclude that the gram formula mass of NH_(4)Cl is 53.5 g/mol (approx)
Answer 2
Answer:

The gram formula mass of NH₄Cl is 53.5 g/mol (3rd option)

How to determine the gram formula mass?

The gram formula mass of a compound is simply the molar mass of the compound.

The gram formula mass of NH₄Cl can be obtained as illustrated below:

  • Molar mass of N = 14 g/mol
  • Molar mass of H = 1 g/mol
  • Molar mass of Cl = 35.5 g/mol
  • Gram formula mass of NH₄Cl = ?

Gram formula mass of NH₄Cl= 14 + (4 × 1) + 35.5

= 14 + 4 + 35.5

= 53.5 g/mol

Thus, we can conclude that the gram formula mass of NH₄Cl is 53.5 g/mol (3rd option)

Learn more about gram formula mass:

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When the compound, Ba(C2H3O2)2, is mixed with water, the Ba(C2H3O2)2 is:soluble because compounds containing the C2H3O2− ion are soluble in water

insoluble because most compounds containing the C2H3O2− ion are insoluble in water

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Answers

Answer:

the answer is soluble because compounds containing the C2H3O2− ion are soluble in water
When the compound, Ba(C2H3O2)2, is mixed with water, the Ba(C2H3O2)2 is insoluble because most compounds containing the C2H3O2− ion are insoluble in water

What ions are in water all the time?

Answers

Answer:

(Ca2 +, Mg2 +, Na+, and K+) and four major anions ( , , SO 4 2 - , and Cl-) with ionic forms of N, P, Fe, and other trace elements at lower concentrations (Livingstone 1963, Meybeck 1979) (Table 4.7).

Which reaction will most likely take place?Pt + FeCl3
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Answers

The correct answer of the given question above would be the third option: Li + ZnCO3. The reaction that will most likely take place is Li + ZnCO3. This is the reaction that will most likely take place since Lithium is very active. Hope this is the answer you are looking for. 

I agree, the answer is Li+ZnCO3.

Balance the following equation. Then determine the mole ratio of Ca(OH)2:Al(OH)3. Al2(SO4)3 + Ca(OH)2 Al(OH)3 + CaSO4

Answers

To balance the reaction, we look at the number of atoms of each element we have. It should be equal for both sides. The balanced reaction is:

Al2(SO4)3 + 3Ca(OH)2 =  2Al(OH)3 + 3CaSO4

The ratio of calcium hydroxide and aluminum hydroxide is 3:2.

Answer: The mole ratio of Ca(OH)_2:Al(OH)_3 is 3 : 2

Explanation:

Law of conservation of mass states that mass can neither be created nor be destroyed, but it can only be transformed from one form to another. In a chemical reaction, total number of individual atoms on reactant side must be equal to the total number of individual atoms on the product side.

All the balanced chemical equation follows law of conservation of mass.

The balanced chemical equation for the combination of aluminium sulfate with calcium hydroxide is:

Al_2(SO_4)_3+3Ca(OH)_2\rightarrow 2Al(OH)_3+3CaSO_4

Mole ratio of any two compounds is basically the ratio of their stoichiometric coefficients.

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#1: Which of the following is an exothermic reaction? A. dissolving ammonium nitrate in water to cool the water B. condensation C. melting ice D. dissolving sugar in water. #2: Two objects (A and B) of the same temperature are in contact with each other. Which of the following statements is true? A. Heat transfers from object B to object A, because molecules from B collide with those from A. B. Heat transfers from object A to object B, because molecules from A collide with those from B. C. Although the molecules collide, no heat transfers because there is no temperature difference between the objects. D. No heat transfers, because there are no collisions between the molecules of the objects. #3: Which of the following parameters is kept constant in a coffee-cup calorimeter? A. temperature B. volume C. pressure D. kinetic energy #4: What type of substance would be best for use in a heating system? A. a liquid with a high specific heat B. a solid with a high specific heat C. a liquid with a low specific heat D. a gas with a low specific heat. #5: The reaction 2 NO(g) → N2(g) + O2(g) has a ΔH = -180.5 kJ. How much heat will be required to produce 44.8 L of NO by the reverse reaction? A. 644 kJ B. 180.5 kJ C. 301 kJ D. 322.3 kJ

Answers

These are the following answers to the five questions:
(1) (B) condensation. Condensation is exothermic, but it's not a reaction, it's a physical change. 
(2) (C) Although the molecules collide, no heat transfers because there is no temperature difference between the objects. 
(3) (C) pressure
(4) (A) a liquid with a high specific heat
(5) Supposing the NO is measured at STP: 
(44.8 L) / (22.4 L/mol) x (180.5 kJ / 2 mol NO) = (B) 180.5 J 

(1) (B) condensation. Condensation is exothermic, but it's not a reaction, it's a physical change. 

(2) (C) Although the molecules collide, no heat transfers because there is no temperature difference between the objects. 

(3) (C) pressure

(4) (A) a liquid with a high specific heat

(5) Supposing the NO is measured at STP: 

(44.8 L) / (22.4 L/mol) x (180.5 kJ / 2 mol NO) = (B) 180.5 J 

Which term describes the point when two objects reach the same temperature and there is no longer a transfer of energy through heat?1. Latent Heat
2.specific Heat
3.thermal equilibrium
4.Heat of Fusion

Answers

Answer: Option (3) is the correct answer.

Explanation:

When two substances or objects at the same temperature do not exchange heat with each other then this state is known as thermal equilibrium.

Whereas latent heat is the release or absorption of energy at a constant temperature.

Specific heat is the amount of heat per unit mass necessary to increase the temperature by one degree Celsius.

Heat of fusion is the amount of energy required to change the state of matter or substance.

Thus, we can conclude that out of the given options, thermal equilibrium describes the point when two objects reach the same temperature and there is no longer a transfer of energy through heat.
C. Thermal Equilibrium
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