1: how many formula units are in 7.9 moles of lithium fluoride?
*give answer using scientific notation*
*round your answer to the appropriate number of significant figures*

2: how many molecules are in 15 moles of carbon dioxide?
*give answer using scientific notation*
*round your answer to the appropriate number of significant figures*

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.

water at room temperature is flowing through a pipe with pressure taps located 10 ft apart along one section of the pipe, which are connected to a mercury (s=13.6) manometer.