Question

Which reaction type is the following reaction?
Hg2(NO3)2 (aq) + 2KCl (aq) → 2KNO3 (aq) + Hg2Cl2 (s)

Suppose the cafeteria decides to make tacos for lunch one day. Each taco will be made with one taco shell, two scoops of ground beef, and three sccops of salsa. If the cafeteria has 150 taco shells, 250 scoops of ground beef, and 300 scoops of salsa, how many tacos can they make?

Predict the products of the following reaction
CaCl2 (aq) + K2SO4 (aq) →

What is the net ionic equation associated with the following reaction?
2AgNO3 (aq) + BaCl2 (aq) → 2AgCl (s) + Ba(NO3)2 (aq)

Suppose you have 20.1 g of Mn. What number of moles of Mn is present?

Suppose you have 15.7 g of Mg. How many Mg atoms are present? Report your answer in scientific notation using the format of 6.022E23 for 6.022 x 1023.

Heroin has the formula C21H23NO5. What is the molar mass of heroin?

Acetylsalicylic acid (sold under the trade name Aspirin) has the formula C9H8O4. Suppose you have 47.2 of acetylsalicylic acid. How many moles of acetylsalicylic acid are present?

Balance the following equation, using the lowest combination of integer values.
[a]Ca(OH)2 + [b]H3PO4 → [c]Ca3(PO4)2 + [d]H2O
Be sure to include a "1" if "1" balances the equation.
Specified Answer for: a, Specified Answer for: b, Specified Answer for: c, Specified Answer for: d

Balance the following equation, using the lowest combination of integer values.
[a]C7H16 + [b]O2 → [c]CO2 + [d]H2O
Be sure to include a "1" if "1" balances the equation. Specified Answer for: a, Specified Answer for: b, Specified Answer for: c, Specified Answer for: d    

Magnesium hydroxide, Mg(OH)2, reacts with HCl according to the following equation.
Mg(OH)2 + 2HCl → MgCl2 + 2H2O
58.3196 g/mol 36.4606 g/mol 95.2104 g/mol 18.0152 g/mol
Given 50.6 g of Mg(OH)2 and 45 g of HCl, what is the maximum yield of MgCl2 if Mg(OH)2 is limiting?      

Magnesium hydroxide, Mg(OH)2, reacts with HCl according to the following equation.
Mg(OH)2 + 2HCl → MgCl2 + 2H2O
58.3196 g/mol 36.4606 g/mol 95.2104 g/mol 18.0152 g/mol
Given 50.6 g of Mg(OH)2 and 45 g of HCl, what is the maximum yield of MgCl2 if HCl is limiting?

Magnesium hydroxide, Mg(OH)2, reacts with HCl according to the following equation.
Mg(OH)2 + 2HCl → MgCl2 + 2H2O
58.3196 g/mol    36.4606 g/mol 95.2104 g/mol 18.0152 g/mol
Given 50.6 g of Mg(OH)2 and 45 g of HCl, what is the theoretical yield of MgCl2?

Magnesium hydroxide, Mg(OH)2, reacts with HCl according to the following equation.
Mg(OH)2 + 2HCl → MgCl2 + 2H2O
58.3196 g/mol 36.4606 g/mol 95.2104 g/mol 18.0152 g/mol

Given the theorectical yield you just calculated from the reaction of 50.6 g of Mg(OH)2 with 45 g of HCl, if your actual yield of MgCl2 is 51.4 g, what is the percentage yield?

Cyclohexane, a common laboratory solvent, is a hydrocarbon, a compound consisting only of C and H. When 2 g of cyclohexane is burned in oxygen, 6.275 g of CO2 and 2.569 g of H2O are produced. Determine the number of moles of carbon in this sample. Report your answer to 4 significant figures.

Cyclohexane, a common laboratory solvent, is a hydrocarbon, a compound consisting only of C and H. When 2 g of cyclohexane is burned in oxygen, 6.275 g of CO2 and 2.569 g of H2O are produced. Determine the number of moles of hydrogen in this sample. Report your answer to 4 significant figures.

Cyclohexane, a common laboratory solvent, is a hydrocarbon, a compound consisting only of C and H. When 2.000 g of cyclohexane is burned in oxygen, 6.275 g of CO2 and 2.569 g of H2O are produced. What is the empirical formula of cyclohexane?
The empirical formula:   C[c]H[h]
Specified Answer for: c Specified Answer for: h

Using the empirical formula you just determined in the previous problem, if a separate experiment gave 84.16 g/mol as the molar mass of cyclohexane, what is the molecular formula of cyclohexane?
The molecular formula: C[c]H[h]
Specified Answer for: c
Specified Answer for: h

Nutra-Sweet is 57.14% C, 6.16% H, 9.52% N, and 27.18% O by mass. Assuming 100 g of Nutra-Sweet, how many moles of hydrogen are present? Report your answer to 3 significant figures.

Nutra-Sweet is 57.14% C, 6.16% H, 9.52% N, and 27.18% O by mass. Assuming 100 g of Nutra-Sweet, how many moles of carbon are present? Report your answer to 4 significant figures.

Nutra-Sweet is 57.14% C, 6.16% H, 9.52% N, and 27.18% O by mass. Assuming 100 g of Nutra-Sweet, how many moles of nitrogen are present? Report your answer to 3 significant figures.

Nutra-Sweet is 57.14% C, 6.16% H, 9.52% N, and 27.18% O by mass. Assuming 100 g of Nutra-Sweet, how many moles of oxygen are present? Report your answer to 4 significant figures.

Nutra-Sweet is 57.14% C, 6.16% H, 9.52% N, and 27.18% O by mass. Find Nutra-Sweet's empirical formula.
The empirical formula:   C[c]H[h]N[n]O[o]
Specified Answer for: c Specified Answer for: h Specified Answer for: n Specified Answer for: o

               

Using the empirical formula you just determined in the previous problem, if Nutra-Sweet's actual molecular weight is 294.30 g/mol, what is its molecular formula?
The molecular formula: C[c]H[h]N[n]O[o]
Specified Answer for: c Specified Answer for: h Specified Answer for: n Specified Answer for: o  

Answer 1

1) The balanced chemical equation for the reaction is given as

Hg₂(NO₃)₂ (aq) + 2 KCl (aq) ------> 2 KNO₃ (aq) + Hg₂Cl₂(s)

The reactants and products except Hg₂Cl₂ are aqueous species and hence soluble in water. Hg₂Cl₂ is a solid species and separates out from the solution. Therefore, the reaction is a precipitation reaction.

2) Treat this as a hypothetical reaction and write

1 taco shell + 2 scoops ground beef + 3 scoops salsa -------> 1 taco

As per the representation above,

1 taco shell = 2 scoops ground beef = 3 scoops salsa = 1 taco.

Find the limiting reactant, the one which produces the minimum number of tacos.

150 taco shells = (150 taco shells)*(1 taco/1 taco shell) = 150 tacos.

250 scoops of ground beef = (250 scoops of ground beef)*(1 taco/ 2 scoops of ground beef) = 125 tacos.

300 scoops of salsa = (300 scoops of salsa)*(1 taco/3 scoops of salsa) = 100 tacos.

Offcourse, the scoops of salsa are the limiting reactant and hence, 100 tacos can be produced (ans).

3) The reactants are given; we need to find out the products along with their physical states.

CaCl₂ (aq) + K₂SO₄ (aq) --------> CaSO₄ + 2 KCl

CaSO₄ is insoluble in water and hence, will precipitate out as a solid. KCl is soluble in water. Therefore, the complete balanced equation is

CaCl₂ (aq) + K₂SO₄ (aq) --------> CaSO₄ (s) + 2 KCl (aq)

4) Write down the balanced chemical equation as given

2 AgNO₃ (aq) + BaCl₂ (aq) -------> 2 AgCl (s) + Ba(NO₃)₂ (aq)

Decompose the aqueous species into ions and write

2 Ag⁺ (aq)+ 2 NO₃^- (aq) + Ba²⁺ (aq) + 2 Cl^- (aq) ---------> 2 AgCl (s) + Ba²⁺ (aq) + 2 NO₃^- (aq)

Cancel out the common ions and write the net ionic equation as

2 Ag⁺ (aq) + 2 Cl^- (aq) -------> 2 AgCl (s)

or, Ag⁺ (aq) + Cl^- (aq) -------> AgCl (s)

5) Atomic mass of Mn = 54.938 g/mol.

20.1 g Mn = (20.1 g Mn)*(1 mole Mn/54.938 g Mn) = 0.365867 mole Mn ≈ 0.3659 mole Mn (ans).

6) Atomic mass of Mg = 24.305 g/mol.

15.7 g Mg = (15.7 g Mg)*(1 mole Mg/24.305 g Mg) = 0.64596 mole Mg.

1 mole Mg = 6.022*10²³ atoms of Mg.

0.64596 mole Mg = (6.022*10²³ atoms of Mg)*(0.64596 mole Mg/1 mole Mg) = 3.88997*10²³ atoms of Mg ≈ 3.890E23 (ans).