Calculate the molar mass:
CsC3H5O3

89.0700 g/mol 

Explanation:

Hope this helps you out

i am going to put the answers in order i dint feel like typing it out so yeah

a

d

c

b

b

b

a

d

a

b

c

c

c

b

d

it's c. elements are placed in rows based on how may valencies electrons have.