Find the formula mass for oxalic acid h2c2o4 use c=12.01, h=1.008 o=16.00

The formula mass of oxalic acid   H2C2O4  is =90.036

Explanation

          =  (2 x 1.008)  + (12.01 x2) + (16 x4)=90.036

the answer is c) gamma rays

hope i : )

given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g