What is the mass in grams of 2.65 moles of Galactose? ( C12H24O12)

508.8g

Explanation:

Mass of one mole= (12×12)+(24×1)+(2×12)

144+24+24=192g

Mass of 2.65 moles=192×2.65=508.8g

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.