The concentration of carbon monoxide in a sample of air is 8.1×10−6. there are molecules of co in 1.00 l of this air at 755 torr and 23 ∘c.

2.0*

Explanation:

Let us calculate total moles (air + CO)

moles (n) = PV /RT

P = 755 torr/760 = 0.9934 atm

V = 1.00 L

R = gas constant

T = 23°C + 273 = 296 K

So,

total moles (n) = 0.9934 x 1.00/0.0821 x 296 = 0.041 moles

mole fraction of CO = 8.1 x

moles of CO =8.1 x *0.041

                     =3.31 x moles

number of molecule of CO =3.31 x *(6.0233x )

                     = 2.0*

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles

a is the best answer your welcome