Molar mass of Na = 23 g/mol
Molar massa of Na2O = 62 g/mol
balanced chemical equation:
4 Na +
1 O2 ------>
2 Na2O
4 . 23 g Na --------------> 2 . 62 g Na2O
x -------------------------> 42,0 g Na2O
124 x = 3864
![x = \frac{3864}{124}](https://tex.z-dn.net/?f=x%20%3D%20%20%5Cfrac%7B3864%7D%7B124%7D%20)
![x = 31,16 g](https://tex.z-dn.net/?f=x%20%3D%2031%2C16%20g%20)
of Na
H2O(s) ==> H2O(l)
<span>The density of liquid H2O = 1.00 g/mL. </span>
<span>The density of ice is 0.917 g/mL. </span>
<span>Suppose we start with 1 mol (18 g) H2O(s) and it melts to the liquid. </span>
<span>As a liquid it will occupy 18g/1.00 = 18 mL. </span>
<span>As a solid it will occupy 18/0.917 = 19.63 mL. </span>
<span>19.63-18.0 = 1.63 mL diffeence. </span>
<span>The heat fusion of ice is 6.01 kJ/mol; therefore, 6.01/1.63 = about 3.69 kJ for each mL difference. </span>
<span>In this experiment we have a difference of 0.109 mL; then 3.69 kJ/mL x 0.109 mL = 0.402 kJ for 0.0657 g Zn. You want per mol Zn and you have 0.0657/65.39 = about 0.001 mol Zn so </span>
0.402 kJ/0.001 = <span>402 kJ/mol Zn</span>
I would say there are approximately 5