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

At 518degc the rate of decomposition of a sample of gaseous

At 518°C, the rate of decomposition of a sample of gaseous acetaldehyde, initially at a pressure of 363 Torr, was 1.07 Torr s-1 when 5.0% had reacted and 0.76 Torr s-1 when 20.0% had reacted. If the reaction rate is prop ...

Question 1 nuclear equationa write a nuclear equation for

Question 1: Nuclear equation a) Write a nuclear equation for the beta decay of thallium-210. b) Plutonium-239, a toxic isotope that cause lung cancer, is an alpha emitter. Write nuclear equation. c) Write the nuclear equ ...

1a rolaids tablet has 550 mg of calcium carbonate and 110

1. A Rolaids tablet has 550 mg of calcium carbonate and 110 mg of magnesium hydroxide. a) Write the two neutralization reactions with stomach acid (assume HCl, don't combine reactions) b) If the acid concentration is 4.0 ...

What mass of nah2po4 must be added to 120 l of 020 m

What mass of NaH 2 PO 4 must be added to 1.20 L of 0.20 M Na 2 HPO 4 to make a buffer solution whose pH=6.90? pK a2 (H 3 PO 4 )=7.21.

1 what is the mass of 38 molecules of so3nbspin g2 what

1) What is the mass of 38 molecules of SO 3  in g? 2) What volume in L of chlorine at 30 o C and 743 torr is required to react completely with 4.76 g aluminum: 2Al(s) + 3Cl 2 (g) → 2AlCl 3 (s) Calculate the moles chlorin ...

Calculate the magnitude of the diffusion-controlled rate

Calculate the magnitude of the diffusion-controlled rate constant at 298 K for a species in (i) water, (ii) pentane. The viscosities are 1.00 × 10-3 kg m-1 s-1, and 2.2 ×10-4 kg m-1 s-1, respectively.

Directionsrefer back to equation 2 and consider carefully

Directions: "Refer back to equation (2), and consider carefully whether you could simply have used the pH value of the solution at the very beginning of the titration, before any base had been added, to determine either ...

A soil analysis was done for the exchangeable cations in

A soil analysis was done for the exchangeable cations in the soil and the results were as follows:Ca = 1.8 g/kg (atomic wt. Calcium is 40 g/mol)Mg = 3.25 cmolK = 3 cmolNa = 0.230 g/kg (atomic wt. of Na is 23 g/mol)H = 9 ...

Write three reactions for the oxidation of pyrite and

Write three reactions for the oxidation of pyrite and explain how these can result in the production of acid waters that are enriched in trace metals and metalloids.

The freezing point of a 1 molar nonelectrolyte such as

The freezing point of a 1 molar nonelectrolyte such as ethylene glycol is. What is the freezing point in degrees C of a 1.79 molar potassium chloride solution? Calculate the osmolarity of a solution made from a 1.876 % ( ...

  • 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