Answer:
When combined with Hubble's visible-light data, astronomers can ... Dark things absorb light, but this invisible stuff neither absorbs, nor ... Is dark matter made of still undiscovered tiny particles, as most physicists suppose?
Explanation:
Oh, cool! I'm learning this too!
This may sound difficult, so let's try a example of one now. How about Boron?
(*hiya, mr.boron! (^u^/)*)
The ATOMIC NUMBER is located at the very top of the group symbol you're referring to.
"So how do I locate it?"
_______________
| 5 | <======Atomic # | B | <====== Symbol
| Boron | <=== Element Name
10.81 <====== Atomic Mass |______________|
In this case, the number is five, which is representing 5 atoms with protons and electrons. It does not have 5 single protons or electrons, otherwise it'd be one group of positive protons, negative electrons, and so on.
Try not to get it confused by ATOMIC MASS, which is located on the bottom (10.81; That could appear as a trick question on a quiz of some sort. It happened to me once, yikes.) The Atomic Mass contains the number of protons and NEUTRONS (The center nucleus of the atom), which contains nada, zero, nothing. It has ABSOLUTELY no charge, at all.
Hope that worked! :)
Can you make the picture clearer please or tell me what I’m supposed to do in comments?
Balanced chemical equation for the reaction is:
2S (g) + (g)+ 2O (l) ⇒
Moles of formed is 5.75 moles.
Moles of oxygen used is 5.75 moles in the reaction.
Explanation:
Data given:
moles of S = 11.5 moles
moles of = ?
Moles of needed =?
balanced equation with states of matter =?
Balanced chemical reaction under STP condition is given as:
2S(g) + (g) + 2O (l) ⇒
From the balanced reaction 2 moles of sulphur dioxide reacted to form 1 mole of sulphuric acid:
so, from 11.5 moles of S, x moles of is formed
2x = 11.5
x = 5.75 moles of sulphuric acid formed.
From the balanced reaction 1 mole of oxygen reacted to form 1 mole of sulphuric acid.
when 11.5 moles of Sulphur dioxide reacted then oxygen in the reaction is 5.75 moles.