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DescriptionBR> When submitting grades in scientific notation, a number like 2300 would be 2.3e+3 or 0.0078 would be 7.8e-3.

Remember entropy values are in units of joules.
must convert to kJ in some problems IF any errors pop up and do sometimes, please let me know!!InstructionsThe sig fig checker has been turned off so feel free to enter near or exact numbers.Assignment Submission

For this assignment, you submit answers by question parts. The number of submissions remaining for each question part only changes if you submit or change the answer.Assignment Scoring

Your last submission is used for your score.     1. – /2.38 points My Notes  Question PartPointsSubmissions Used      The specific heat of copper metal is 0.385 J/g ·°C. How many joules of heat are necessary to raise the temperature of a 1.40  g block of copper from 30.6 °C to 89.8 °C?
      

    
(b) Calculate the amount of heat transferred when 55.0  g of CH3OH(g), molar mass = 32.04g/mol, are decomposed by this reaction at constant pressure.
     (b) LiCl(s) is formed from Li(s) and Cl2(g).      (c) Zinc metal dissolves in hydrochloric acid, forming ZnCl2(aq) and H2(g).      (d) Silver bromide precipitates upon mixing AgNO3 and KBr(aq).     

      (b) Does the reaction lead to an increase or decrease in the disorder of the system?     
(c)[Answer sig. to 0.1’s place] Calculate G° for the reaction at 298 K.
    

 

 

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I need Chem. paper (3 pages) about desalting water( deffinition, process,information,……)

 

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1- The peak power of a 6ft. diameter antenna is 10 watts and its duty cycle is 0.250. The wave length is 0.03m/cycle. Find the power density in mw/cm2 at 50 meters from the antenna.

2- The activity of an isotope was determined to be 4000mci on Monday at 10.00 am on Tuesday at the same time its activity was found to be 3200mci. Find this isotope’s half-life.

·       For credit you must use the appropriate equation.

3- Given the energy range of a radiation source to be 0.5 ev.

Calculate the same energy range in joules.

·       Don’t use the correction factor or 1v= 1.6 Χ10-10 joules.

4- A wall was constructed in the middle ofthe “near field” region of Non -ionizing   redaction source that has a peak power of 50 meters. The diameter of its transmitting antenna is 4 meters. Determine the attenuation factor for this wall.

·       Don’t make any assumption.

5- A 15mw energy laser has a beam exit diameter of 2cm and beam divergence of 0.0002radians.

a)  Calculate the power density of the beam at 100meters away from the source.

b)  Assuming that this beam has a wave length of 312nm, and the viewing time is 10minutes/day, determine if the TLV is exceeded.

 

After 7 hours of its preparation determine the portion left of a radioactive isotope, if its half-life is known to be 5 hours.

 

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Please check the attachment.

 

Need draft on 17th July

Final draft on 25th July

 

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