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Natasha_Volkova [10]
3 years ago
14

Help me please will mark brainliest ​

Chemistry
2 answers:
Ilya [14]3 years ago
4 0

Answer:

D

Explanation:

Period is horizontal group, so left to right it does increase. Down the side they are numbered 1-7 and depending on valence electrons they can have different properties

murzikaleks [220]3 years ago
4 0

Answer:

A

Explanation:

Im pretty sure it's A. I MIGHT be wrong so dont quote me on this. THis is what the internet says:

"Atomic Radius. Atomic radii decrease from left to right across a period and increase from top to bottom along a group."

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3 years ago
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How many liters of water can be made from 55 grams of oxygen gas and an excess of hydrogen at a pressure of 12.4 atm and a tempe
polet [3.4K]
First, we need the no.of moles of O2 = mass/molar mass of O2
                                                             = 55 g / 32 g/mol
                                                             = 1.72 mol
from the balanced equation of the reaction:
2H2 (g) + O2(g) → 2H2O(g)
we can see that the molar ratio between O2: H2O = 1: 2 
So we can get the no.of moles of H2O = 2 * moles of O2
                                                                  = 2 * 1.72 mol
                                                                  = 3.44 mol
So by substitution by this value in ideal gas formula:
PV = nRT

when P = 12.4 atm  & n H2O = 3.44 mol & R= 0.0821 & T = 85 + 273=358K

12.4 atm *V = 3.44 * 0.0821 * 358 = 8.15 L
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If Oxygen gains 2 electrons<br> what charge will it have?
Scilla [17]

Answer:

A very powerful one

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