What is the molecular mass of potassium hydrogen carbonate (khco3)? a. 68 g/mol b. 84 g/mol c. 100 g/mol d. 116 g/mol

Molecular mass of is 100 g.

Explanation:

Molecular mass of a molecule is the summation of atomic masses of all constituting atoms.

Molecular mass of  = (Atomic mass of K)+(Atomic mass of H)+(Atomic mass of C)+ (Atomic mass of O)

So, molecular mass of = (39 g)+(1 g)+ (12 g)+( 16 g) = 100 g

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.