Answer:
29.) 141 mi/gal
30.) # of protons
Explanation:
29.) This is a double unit conversion. The equation is:
[tex]\frac{60.0km}{1L} * \frac{3.785L}{1 gal} * \frac{1mi}{1.609km}= 141.143567mi/gal[/tex]
Because your original number (60.0) has 3 significant figures, you round to 141 mi/gal.
30.) The identity of an element is always determined by the # of protons. If the # of protons changes, it becomes a different element.
