Help i have a test coming up

1mole of propane weighs

12g×3+1g×8

36g+8g

44g

6.023×10²³44g

5.83×10¹⁷x

5.83×10¹⁷×44g=x×6.023×10²³

(256.52×10¹⁷g)÷6.023×10²³=x

x=42.59×10¹⁷‐²³

x=4.26×10-⁶×10

x=4.26×10-⁵

answer

4. 4.27×10-⁵

what is the average time it took the car to travel 0.25 meters?

⇒ 2.23 seconds

what is the average time it took the car to travel 0.50 meters?

⇒ 3.13 seconds