Question
in the reaction 2Na + Cl2 --> 2NaCl how many grams of NaCl are produced when 25 g. of sodium reacts completely to form NaCl?
Answers
first thing to do here is to balance the chemical equation.
2Na + Cl2 --> 2NaCl
then we get the masses of Sodium and Chlorine from periodic table of elements in order to calculate the molar mass of NaCl. from periodic table,
Na = 23
Cl = 35.5
thus, NaCl = 23+35.5 = 58.5 g/mol
therefore,
25 g Na * (1 mol Na / 23 g Na) * (2 mol NaCl / 2 mol Na) * (58.5 g NaCl / 1 mol NaCl) = 63.57 g NaCl
note that the ratio (2 mol NaCl / 2 mol Na) came from the balanced chemical reaction.
hope this helps~ :)
2Na + Cl2 --> 2NaCl
then we get the masses of Sodium and Chlorine from periodic table of elements in order to calculate the molar mass of NaCl. from periodic table,
Na = 23
Cl = 35.5
thus, NaCl = 23+35.5 = 58.5 g/mol
therefore,
25 g Na * (1 mol Na / 23 g Na) * (2 mol NaCl / 2 mol Na) * (58.5 g NaCl / 1 mol NaCl) = 63.57 g NaCl
note that the ratio (2 mol NaCl / 2 mol Na) came from the balanced chemical reaction.
hope this helps~ :)