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

86 solutions

Thermochemical Equation

Q. How many kilojoules of heat will be released when exactly 1.58 moles of iron, Fe, is burned to form Fe2O3(s) at standard state conditions? ΔHf(Fe2O3) = -824.2 kJ/mol.

Solved • Dec 5, 2019

Thermochemical Equation

Q. When 15.75 g of Ba (137.3 g/mol) reacts completely with oxygen, 63.5 kJ of heat are released. Determine H for the reaction as written.2 Ba(s)+ O2(g)2 BaO(s)A. -553.6 kJB. -63.5 kJC. -276.8 kJD. -1107 kJ

Solved • Dec 1, 2019

Thermochemical Equation

Q. For the reaction C(s) + O2 => CO2 (g) ΔH°rxn = -393 kJ. How many grams of C(s) must be reacted to release 275 kJ of heat?

Solved • Nov 20, 2019

Thermochemical Equation

Q. Given the thermochemical equation, 2Cu2O(s) 4Cu(s) + O2(g), ΔH = +333.8 kJ/mol, calculate the mass of copper produced when 1.47 × 104 kJ is consumed in this reaction. (a)11.2 kg (b)176 kg (c)44.0 kg (d)334 kg (e)782 kg

Solved • Nov 19, 2019

Thermochemical Equation

Q. Given the thermochemical equation, H2(g) + Br2(l) 2HBr(g), ΔH = −72.4 kJ/mol, calculate the amount of heat released when a kilogram of Br2(l) is consumed in this reaction. (a)7.24 × 104 kJ (b)453 kJ (c)906 kJ (d)227 kJ (e)724 kJ

Solved • Nov 19, 2019

Thermochemical Equation

Q. Consider the thermochemical equation for the combustion of acetone (C3H6O), the main ingredient in nail polish remover: C3H6O(l) + 4 O2(g) ¡ 3 CO2(g) + 3 H2O(g) ∆H° = -1790 kJ If a bottle of nail polish remover contains 177 mL of acetone, how much heat is released by its complete combustion? The density of acetone is 0.788 g/mL.

Solved • Nov 19, 2019

Thermochemical Equation

Q. Consider the following chemical equation: C3H8(g) + SO2(g) → 3CO2(g) + 4H2O(l) ΔH = -2220 kJ How much thermal energy is given off when 11.0 g of propane gas (CH8) is burned at constant pressure? a) 26.0 kJ b) 555 kJ c) 2220 kJ d) 1670 kJ

Solved • Nov 19, 2019