Calculate the no.of atoms present in 3.4g of H2S
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Convert 3.4 g H2S (h2s means nothing to me) to moles. mols = grams/molar mass.
Then convert mole H2S to molecules remembering that there are 6.022 x 10^23 molecules H2S in a mole of H2S.
Finally, multiply that number by 3 since there are three atoms per molecule of H2S (2 atoms H and 1 atom S).
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