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

244 solutions


Q. The heat of combustion for a sample of coal is 23.0 kJ/g. What quantity of coal (in grams) must be burned to heat 500.0 g of water from 20.0°C to 95.0°C?

Solved • Feb 11, 2020


Q. Consider an aqueous reaction of equal volumes of 2.0 M HCl and 2.0 M NaOH, with a final volume of 100.0 mL and a density of 1.03 g/ml. What will the change in heat (qrxn) be for this reaction given a positive temperature change of 2.5 degrees Celsius? Assume a value of 4.18 J g-1 C-1for Csoln

Solved • Feb 4, 2020


Q. Ice cubes at 0°C with a total mass of 435 g are put in a microwave oven and heated with 750. W (750. J/s) of energy for 6.00 minutes. What is the final temperature of the water from the melted ice? Assume all of the microwave energy is absorbed by the ice/water and no heat loss by the ice/water. The enthalpy of fusion for ice is 6.02 kJ/mol and the heat capacity for water is 4.18 J/g・°C.

Solved • Feb 2, 2020


Q. Which conditions would result in an exothermic ΔHsolution? a.ΔHsolvent>> ΔHsolute d.ΔHsolute< ΔHhydration . b.ΔHsolute> ΔHhydration . e.Not enough information to determine. c.ΔHsolute≈ ΔHhydration

Solved • Jan 26, 2020


Q. Determine ΔHsolute for KBr if the ΔHsolution of KBr is +19.9 kJ/mol and the ΔHhydration of KBr is −670 kJ/mol. a.+650 kJ/mol . d.−710 kJ/mol . b.−650 kJ/mol . e.−690 kJ/mol . c.+690 kJ/mol

Solved • Jan 26, 2020


Q. he salt barium bromide is soluble in water. When 8.51 g BaBr2 is dissolved in 103.00 g water, the temperature of the solution increases from 25.00 °C to 26.50 °C. Based on this observation, calculate the dissolution enthalpy, ΔdissH, of BaBr2. Assume that the specific heat capacity of the solution is 4.184 J g-1 °C-1 and that the energy transfer to the calorimeter is negligible. ΔdissH =__?____ kJ/mol ****I got 24.10 but it is saying its wrong

Solved • Jan 24, 2020


Q. The addition of hydrochloric acid to a silver nitrate solution precipitates silver chloride, When you combine 50.0ml of 0.100M silver nitrate with 50.0 ml of hydrochloric acid in a coffee cup calorimeter, the temperature changes from 23.40 degrees celsius to 24.21 degrees celsius, Write a balanced chemical equation and calculate delta Hrxn, Use 1.00g/ml as the density of the solution and Cs = 4.18J/g*degrees celsius as the specific heat capacity.

Solved • Jan 21, 2020