Nitrogen
oxygen
carbon dioxide
varying amounts of dust and pollen
varying amounts of trace gases such as methane, ozone, hydrogen, argon, carbon, monoxide
<span>They are isotopes of the same element</span>
Depending what you have available there are a few different chemicals you can combine to show an obvious reaction without special equipment. Vinegar and Baking soda is a common mixture. Perhaps something like HCl and NaOH mixed will produce heat.
1) Chemical equation
2Al + 6 HCl ---> 2Al Cl3 + 3 H2
2) molar ratios
2 mol Al : 3 moles H2
3) Proportion
2 mol Al / 3mol H2 = x / 9 mol H2
4) Solve for x
x = 9 mol H2 * 2 mol Al / 3 mol H2 = 6 mol Ag
Answer: 6 moles
Cr(NO3)3
because Chromium (III) formula is Cr2O3 And Nitrate formula is NO3