Please help me I will do anything can you please show your work

(1) 720 seconds (2) 10800 seconds (3) 17 dozens (4) 1.45 x (5) 13.29 moles

Explanation:

(1) 720 seconds

1 minute = 60 seconds

12 minutes = 720 seconds   (12 x 60)

(2) 10800 seconds

1 hour = 60 minutes  1 minute = 60 seconds

3 x 60 = 180 minutes in 3 hours

180 x 60 = 10800 seconds in 180 minutes that are in 3 hours

(3) 17 dozens

1 dozen = 12

204 ÷ 12 = 17 dozens  

(4) 1.45 x

8.00 moles CO2 x = 24.0 moles atoms

24.0 moles x = 1.45 x

(5) 13.29 moles

sorry but I'm not fully sure if this one is correct

8 x x = 13.29 moles

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

it is a solid

explanation: