Question

Using the balanced equation 2Na(s) + Cl2(g) --> 2NaCl(s), what is the volume of Cl2 gas needed to form 23 grams of NaCl at a temperature of 37C and 689 torr?

Answer 1

first, find how many moles 23 g of NaCl are.

Answer 2

After you wanna use the coefficients to relate the 2 subtances.
Using the stoichiometric coefficients to find moles produced.
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set it up like this:

e.g. for a general reaction:

\(\color{red}{a}A + \color{blue}{b}B\) \(\rightleftharpoons\) \( \color{green}{c}C\)

where upper case are the species (A,B,C), and lower case (a,b,c) are the coefficients ,

\(\dfrac{n_A}{\color{red}{a}}=\dfrac{n_B}{\color{blue}{b}}=\dfrac{n_C}{\color{green}{c}}\)

from here you can solve for the moles of anyone substance.
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For example: if you have moles of B= 2, how many moles of C did you produce?

solve algebraically: \(\dfrac{2}{\color{blue}{b}}=\dfrac{n_C}{\color{green}{c}}\rightarrow n_c=\dfrac{2*\color{green}{c}}{\color{blue}{b}}\)

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Then use the ideal gas law: PV=nRT

Answer 3

Thank you this is a big help. Getting started is usually my problem.

Answer 4

no problem !