Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Chemistry Expert

problem 1: Hess's Law in the laboratory

Nitrous acid (HNO2) is an unstable compound when prepared by the following reaction:

HCl (g) + NaNO2 (s) → HNO2 (l) + NaCl (s).

As the product of the above reaction is unstable, the enthalpy cannot be determined directly in the laboratory. Use Hess’s law to determine the enthalpy of the above reaction using the information below.

2 NaCl (s) + H2O (l) → 2 HCl (g) + Na2O (s) Δ Ho = 506.89 kJ
NO (g) + NO2 (g) + Na2O (s) → 2 NaNO2 (s) Δ Ho = -427.17 kJ
NO (g) + NO2 (g) → N2O (g) + O2 (g) Δ Ho = -42.89 kJ
2 HNO2 (l) → N2O (g) + O2 (g) + H2O (l) Δ Ho = 33.07 kJ

Quote your answer to one decimal place.

problem 2: Heat Capacity Revision
 
Determine the amount of energy (heat) in joules required to raise the temperature of 9.08 g water from 25 ºC to 66.1 ºC. The heat capacity of water, that is the amount of energy required to raise the temperature of one gram of water by oneCelsius degree, is 4.184 J g−1 ºC−1. Quote the answer to 2 significant figures.

problem 3: Heat Capacity of Calorimeter

A student adds 45.1 g of water to a calorimeter and allows the temperature to stabilize in a thermostat bath at 25.00°C.

Next, s/he adds 55.8 g of 100.0°C water.

The final temperature of the entire apparatus comes to 44.2°C.

What is the effective heat capacity of the calorimeter in J/°C?

Take the specific heat capacity of water as 4.184 J g-1°C-1

Include a unit in your answer. Enter all parts of the unit in single line format. For ex, if your unit is mol L-1, present this as mol L-1. If your unit contains °C, please present this as C rather than °C.

problem 4: Enthalpy of reaction of magnesium with dilute HCl

In a different experiment, the student uses another calorimeter with a heat capacity of 133.1 J/°C. S/he fills the calorimeter with 100.0 g of 25.00°C dilute HCl solution and adds 0.510 g Mg metal (24.3 g/mol). The final temperature of the apparatus comes to 41.85°C.

What is the enthalpy change for the reaction as written?

Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g)

Take the specific heat capacity of the dilute acid solution as being equal to that of water, and neglect the heat capacity of the magnesium metal.

Chemistry, Academics

  • Category:- Chemistry
  • Reference No.:- M9606

Have any Question? 


Related Questions in Chemistry

Explain how bacteria are intimately involved in the

Explain how bacteria are intimately involved in the generation of acidic mine waters

The following reaction takes place at a certain elevated

The following reaction takes place at a certain elevated temperature: Fe 2 O 3 (s) + 3CO(g) → 2Fe(l) + 3CO 2 (s) What is the percent yield of iron if 50.1 g Fe 2 O 3 in excess CO produces 19.5 g Fe? The M.W. of Fe 2 O 3 ...

Potassium sulfate is commonly used in fertilizers an

Potassium sulfate is commonly used in fertilizers. An agricultural researcher in alaboratory measures and weighs a 150.0-g sample of potassium sulfate for herexperiment. The solid sample is dissolved in enough water to m ...

Consider a string with a length of 545 cm tied at both end

Consider a string with a length of 54.5 cm tied at both end (like on a stringed instrument). If the frequency of the first harmonic on the string is 256 Hz, determine the speed of the wave in the string. Post your answer ...

Please create 1 synthesis you get to choose any starting

Please create 1 synthesis (you get to choose any starting material) but you should demonstrate all of the following reactions and the product: oxymercuration +hydroboration+ addition+ KMnO4 + hydrolysis + LDA . reactions ...

A sample has a specific heat of 0155 calgmiddotdegc how

A sample has a specific heat of 0.155 cal/g·°C. How much energy will be required to raise the temperature of the sample from 20.0°C to 35.0°C if the sample has a mass of 8.0 g?

Jenny and mark complete a reactivity experiment by placing

Jenny and Mark complete a reactivity experiment by placing samples of metals into water. They initially place small shards of potassium into water and observe that hydrogen gas and potassium hydroxide solution are produc ...

1 when h2 gas was released by the reaction of hcl with zn

1. When H2 gas was released by the reaction of HCl with Zn, the volume of H2 collected was 66.0 mL at 26 °C and 750 mmHg . A. What is the volume of the H2 at 0 °C and 1.00 atm pressure (STP)? 2. Express the temperature n ...

How many grams of silver nitrate are required to produce

How many grams of silver nitrate are required to produce 44.00 g of aluminum nitrate? 6AgNO 3   +  Al 2 (SO 4 ) 3   →  3Ag 2 SO 4   +  2Al(NO 3 ) 3

What is the net ionic equation for the following

What is the net ionic equation for the following reaction? AgNO3 (aq) + NaCl (aq) AgCl (s) + NaNO3 (aq)

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro