Currently in this equation, you have 2 hydrogen atoms and 2 oxygen atoms on the left, and then 2 hydrogen atoms and 1 oxygen atom on the right. To balance, you would need to even out the oxygens, so we can first place a 2 in front of H2O to get:
H2 + O2 -> 2H2O
Now, however, you can see that we have too many hydrogen atoms on the right, so to get the final answer, we add a 2 in front of hydrogen on the left:
2H2 + O2 -> 2H2O
I hope this helps!
<span>Mendeleev's solution was to group elements that shared similar properties, after the table was revised according to atomic number, newly discovered elements fell into place. </span>
Answer:
I think you can predict it by the number of protons in it.
Assuming that the ammonium sulfide formula is (NH4)2S then you can see that there are 2 nitrogen, 8 hydrogen and 2 sulfur atoms for every ammonium sulfide. If the amount of ammonium sulfide is 8.9 moles, then the number of hydrogen atoms should be: 8/1 * 8.9 mol= 71.2 moles
<u>Answer:</u> The density of unknown material is 7.2 g/mL
<u>Explanation:</u>
We are given:
Volume of water already in the container, = 22 mL
Volume of water rise in the cylinder, V = 27 mL
Volume occupied by unknown material =
To calculate density of a substance, we use the equation:
We are given:
Mass of unknown material = 36.0000 g
Volume of unknown material = 5 mL
Putting values in above equation, we get:
Hence, the density of unknown material is 7.2 g/mL