Solution-Energy released by the hand-warmer

Energy released by the hand-warmer

Assignment Help Chemistry

Reference no: EM131118816

A hand-warmer purchased by campers and skiers consists of a sealed outer plastic bag and an inner perforated plastic bag containing powdered iron, water, salt and sawdust. When the inner bag is taken out and shaken it becomes hot because the following reaction occurs:

4Fe(s) + 3O₂(g) ® 2Fe₂O₃(s); DH = -823 kJ mol^-1

The bag contains 15.0 g of iron that reacts completely.

Calculate the energy released by the hand-warmer.

Reference no: EM131118816

Questions Cloud

Find the steady-state capital stock per worker : Consider an economy described by the production function: Y = F (K, L ) = K1/2L1/2 where the depreciation rate is δ and the population growth rate is n. Find the per worker production function. Find the steady-state capital stock per worker as a func..

Calculate the energy input : What is the calibration factor of a calorimeter if a current of 1.20 A at a potential difference of 5.67 V raises its temperature by 1.25°C in 60.0 seconds. Calculate the energy input, using E = VIt.

Heat of combustion of ethyne : What is the heat of combustion of ethyne in kJ mol-1 and kJ g-1?

What did you enjoy most about hospital week : What did you enjoy most about Hospital Week? What would you like to see done differently? Were you aware of the Hospital Week dates and activities as advertised in The Pulse, email messages and posted materials

Energy released by the hand-warmer : The bag contains 15.0 g of iron that reacts completely. Calculate the energy released by the hand-warmer.

Design computer architecture to secure the computer system : Access control defines how users should be identified, authentication, and authorized. These issue are carried out differently in different access control models and technologies, and it is up to the organization to determine which best fits its b..

Combustion of butane : Butane is used as the fuel in pocket cigarette lighters. It is a liquid when stored under pressure in the lighter, but vaporises when the valve is opened. Combustion of butane is represented by the equation:

Summary of the article conclusions and your own opinions : Choose a journal article from the CSU Online Library that deals with any of the material presented in the first four units of this course. The article itself must be more than one page in length. The EBSCO Database (Business Source Complete) is a ..

Energy change during the reaction : A temperature rise of 1.78°C was observed when 1.00 × 10-3 mol of propane gas was burnt in a calorimeter. The calibration factor of the calorimeter was previously determined to be 1250 J °C-1. Calculate the energy change during the reaction.

User Account

All Pages

Energy released by the hand-warmer

Reference no: EM131118816

Reference no: EM131118816

Questions Cloud

Reviews

Write a Review

Chemistry Questions & Answers

Steps in the mechanism for the following reaction

Prior to placing piece of metal into the graduated cylinder

Write the structures of the saytzeff elimination

Calculate ph - chemistry questions

How many mols of hydrogen can produce

Analysis of corrosion mechanisms

Chemical and pharmaceutical science

Calculate the approximate sulphur

What is the structure - stereochemistry

Design a qualitative analysis scheme

What will be the resultant pressure

The 1h nmr spectrum

Assured A++ Grade

Academics

Major Subjects

Majors

Get In Touch

TERMS & POLICIES

HELP & SUPPORT