Chemistry Homework Help

24/7 Chemistry Homework Help

Get step-by-step solutions from expert tutors.

How it works?

Ask a question

Type, take a picture, or paste your question with all necessary details to ensure high-quality responses.

Get an answer in less than 24hrs

Once our tutors receive the question, they'll begin. You'll get an email once the solution is ready.

Get Notified

We will send you email and text notification to let you know when your question is answered.

Browse Homework Solutions

11,512 solutions

Solution Stoichiometry

Q. An impure sample of table salt that weighed 0.842 g, when dissolved in water and treated with excess AgNO3, formed 2.044 g of AgCl. What is the percentage of NaCl in the impure sample?

Solved • Jun 19, 2019

Mass Percent Formula

Q. What is the percentage of sodium in pure table salt?

Solved • Jun 19, 2019

Calorimetry

Q. Suppose a constant pressure calorimeter in which an exothermic reaction occurs. On the system determines the only false alternative. A) The internal pressure of the calorimeter is a function of the reaction heat characteristic of the reaction. B) The temperature of the sample rises because of the energy released by the chemical rearrangements. C) The temperature of the sample is not over because of the total kinetic energy of the molecular components of the sample. D) The system can be appro

Solved • Jun 19, 2019

Gibbs Free Energy

Q. Choose the one alternative that best completes the statement or answers the question. At 25°C, ΔG°f is -620 kJ/mol for SiCl4(g) and -592 kJ/mol for MgCl2(s). Calculate ΔG° for the reaction, SiCl4(g) + 2 Mg(s) →2 MgCl2(s) + Si(s) and determine if the reaction is spontaneous at 25°C if the pressure of SiCl4(g) is 1 atm. A) ΔG° = 28 kJ; the process is nonspontaneous. B) ΔG° = 28 kJ; the process is spontaneous. C) ΔG° = -564 kJ; the process is spontaneous. D) ΔG° = -564 kJ; the process is nonspontaneous.

Solved • Jun 19, 2019

Gibbs Free Energy

Q. Choose the one alternative that best completes the statement or answers the question. Calculate the standard free energy for the reaction given. 2 CH3OH(l) + 3 O2(g) →2 CO2(g) + 4 H2O(l) Species ΔG°f kJ/mol CH3OH (l) -166.4 O2 (g) 0.0 CO2 (g) -394.4 H2O (l) -237.2 A) -465.2 kJ B) -2069.8 kJ C) -1404.8 kJ D) -797.8 kJ

Solved • Jun 19, 2019

Redox Reactions

Q. Based on the reactions below, determine the true statement: 1) Only b) is redox. And the oxidizing and reducing agents are respectively Br and Ca. 2) a) and c) are REDOX, in the first the oxidizing agent is magnesium and in the second the Iron (II). 3) a) is REDOX, its oxidizing agent is molecular magnesium. 4) a) and c) are REDOX, in the first the oxidizing agent is the magnesium and the reducer the molecular oxygen. 5) a) and c) are REDOX, in the former the oxidizing agent is molecular oxygen

Solved • Jun 19, 2019

Gibbs Free Energy

Q. Choose the one alternative that best completes the statement or answers the question. Which of the following is zero at 25°C? A) ΔG°f for H2O (l) B) ΔG°f for N2(g) C) S° for H2O (l) D) S° for N2 (g)

Solved • Jun 19, 2019