Welcome to TechForums.info!   

Advertisments:



Gr.11 Chemistry Questions?

MP3 Players Discussion

Gr.11 Chemistry Questions?

Postby Danforth » Mon Oct 02, 2017 10:06 am

1. For soiled clothes, a manufacturer recommends adding 60.0g of bleach, NaClO, to laundry. How many moles of bleach is this?

2. The average person exhales about 900g of carbon dioxide, CO2, each day. How many moles does a person exhale in one hour

3. An MP3 player case is made of plastic and aliminum. The aluminum part of the case has a mass of 80.00g. Calculate the number of atoms in this 80.00g sample of aluminum.

4. Carbon tetrachloride, CCl4, was widely used as a refrigerant and in fire extinguishers until it was determined to be harmful to the environment. A fire extinguisher shoots out 1.50kg of carbon tetrachloride. How many molecules of this compound were released?

5. A spacecraft took a 5.0g sample of sulphuric acid, H2SO4, from the planet Venus. A) How many molecules of H2SO4 did the sample include? B) How many atoms of hydrogen, sulphur and oxygen did the sample of H2SO4 include?

I'm really having troubles with 3-5 and I already did 1 and 2 but I just want someone to do it so I can double check my answer. Thanks to the person who answers these :)
Danforth
 
Posts: 14
Joined: Thu Jan 16, 2014 3:42 am

Gr.11 Chemistry Questions?

Postby Whittaker » Tue Oct 03, 2017 7:38 am

1.


(60.0 g NaClO) / (74.4424 g NaClO/mol) = 0.806 mol NaClO

2.


(900 g CO2/day) / (44.00964 g CO2/mol) / (24 hr/day) = 0.852 mol/hr

3.


(80.00 g Al) / (26.98154 g Al/mol) x (6.023 x 10^23 atoms/mol) =

1.785 x 10^24 atoms Al

4.


(1500 g) / (153.8236 g CCl4/mol) x (6.023 x 10^23 molecules/mol) =

5.87 x 10^24 molecules CCl4

5.


(5.0 g H2SO4) / (98.0791 g H2SO4/mol) x (6.023 x 10^23 molecules/mol) =

3.1 x 10^22 molecules H2SO4

(3.1 x 10^22 molecules H2SO4) x (2 atoms H / molecule H2SO4) =

6.2 x 10^22 atoms H

(3.1 x 10^22 molecules H2SO4) x (1 atoms S / molecule H2SO4) =

3.1 x 10^22 atoms S

(3.1 x 10^22 molecules H2SO4) x (4 atoms O / molecule H2SO4) =

1.2 x 10^23 atoms O
Whittaker
 
Posts: 19
Joined: Sun Mar 09, 2014 10:24 am


Return to MP3 Players

 


  • Related topics
    Replies
    Views
    Last post
cron