Question #ce668

1 Answer
Stefan V. · Luke W.
Nov 23, 2016

1.7 * 10^22 1.7⋅1022 molecules of "H"_2"O"H2O

Explanation:

Given "0.5 g"0.5 g of "H"_2"O"H2O and using the molar mass of water

M_( "H"_2"O") = "18.01528 g/mol"MH2O=18.01528 g/mol

you have

(0.5cancel("g"))/(18.01528cancel("g")"/mol") = "0.02775 moles"

There are 6.022 xx 10^23 particles in a mole.

(6.022 * 10^23"molecules H"_ 2"O")/(1cancel("mol")) * 0.02775cancel("moles") = 1.7 * 10^22"molecules H"_2"O"

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