Question

A quantos mols correspondem a 100g de ácido fosforoso (H3PO4) ?

Answer 1

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$\sf~massa~molar~do~H_3PO_4:\\\sf 3\cdot1+31+4\cdot16=3+31+64=98~g/mo\ell\\\sf 98~g\longrightarrow1~mo\ell\\\sf100~g\longrightarrow x\\\sf 98x=100\\\sf x=\dfrac{100}{98}\\\huge\boxed{\boxed{\boxed{\boxed{\sf x=1,02~mo\ell}}}}$