Question

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Molen of munt Con (61.96 gonzo S7.59 arom NZD 22. USING MOLE-MOLE FACTORS IN CALCULATIONS Practice Problem 7.19 4 Na(s) + O2(g) – - 2 Na o(s) 575g kat How many grams of Na, are produced when 57.5g of Na reacts How many grams of o, are needed in a reaction that produces 75.Og of Na O? - naz 23x2 46 O ile to

Answer 1

4 Ng(s) + 0,19) -->2N9,0 (s) (a) moles of Na= mass : 57.5g = 9.5 mol 9. MOSS 11. molar mass 2391mol I mol By sun, unol na producera 2 mol Nazo 72.5 mol Na procłyle= x 2.5 mol Nano . ..71.25 mol N920 Now, massa molesx molar mass of Nazo = 1025 mol x 62 gimol =17705 g Nazo produced (b) Moles of Ngo = massa 75g. molar mass 62 g/mol By son, 2 mol Nazo produced by = imol O2 pod / moi Ng,0 produced by = (* *2.211 mol O2 . '=0.605 mol Oz. Now, massa moles x molar mass of Ozi . 70.605 mol x 32 g/mol = /19. 36 g 02 needed