How many hydrogen atoms are contained in 167 grams of propane?

Propane is C3H8

So Molar mass propane = 3*12 + 8*1 = 44 
No. of moles of propane = 167/44 = 3.795 moles

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.

the answer is a and have a great day