Calculate the total mass of these letters in grams (mxe=131.29amu)

We know avogadro's number = 6.023 x 10²³

1 amu = 1 atomic mass unit = 1 / (6.023 x 10²³) gm = 1.66 x 10⁻²⁴grams

Now, to convert amu to grams,

131.29 amu = 131.29 x 1.66 x 10 ⁻²⁴grams

= 2.18 x 10 ⁻²² grams is the answer