Give the mass percent of hydrogen in c14h19no2.

8.1 %

Explanation:

Molecular mass of  =  235 g/mol

Atomic mass of hydrogen atom = 1 g/mol

Percentage of an element in a compound:

Mass Percentage of hydrogen:

The mass percent of hydrogen in is 8.1%.

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.

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