Question

ENERAL CHEMISTRY 1/ will exe? Destion 4 ot yet nswered How many hydrogen atoms are there in 0.402 g of water? Molar mass: H20 = 18.02 g/mol; Avogadro No. = 6.022 x 1023 arked out of 67 Flag uestion Select one: a. 1.20 x 1022 b. 4.02 x 1022 C 2.71 x 1023 d. 1.34 x 1023 e. 2.69 x 1022

Answer 1

option (e) is correct one.

Given Molar mass of water = 18.02 g ind Avogadro No. 23 = 6.022x10 we have 0.402g of water = 0.402 gram mole of water. 18.02 = 0·022 30854606 gram mole of water Number of molecules in one grammole of water 6.022 X10 23 22 Number of molecules in 0.02230854606 gram mole of water = 6.022 x 1023x0.02230854606 = 1.343420644x10 since watu Molecile contains two hydrogens and one oxygen atom. So, Number of hydrogen atoms in o.uo2 grams of water=281-343420644 x 10? 26.8684 X1021 ~ 26.9x121 = 2.69x10 So, option (e) is correct [Last option] 22 22