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-BARSIC- [3]
2 years ago
13

Name the element which lies in group IA and 3rd period. What is the valency of it and why?​

Chemistry
2 answers:
Jlenok [28]2 years ago
4 0

Answer:

Bro I got notification of this question but soory I don't know the answer Hope you understand me

laila [671]2 years ago
3 0

Answer :

Na valency 1

Explanation:

Na -sodium.

This element is in the 1A group, so it has 1 electron on the last (valent) level.

So, only 1 electron can participate in forming chemical bond, and therefore the valency of Na is 1.

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In the gravimetric method, is it important that you dissolve your sample in exactly 10 ml of water? why or why not?.
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8 0
1 year ago
If I have 2 liters of gas held at a pressure of 78 atm and a temperature of 900 k, what will be the volume of the gas if I decre
dangina [55]

Answer:

V2 = 2.88L

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P1= 78atm, V1= 2L, T1= 900K, P2= 45atm, V2=? T2= 750K

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7 0
3 years ago
If you start with 13 mole H2O and 50 grams of O2 what is the percent yield of H202 if 100 grams of H202 is actually made?
dmitriy555 [2]

Answer:

94.1 %

Explanation:

We firstly determine the equation:

2H₂O + O₂ →  2H₂O₂

2 moles of water react to 1 mol of oxygen in order to produce 2 moles of oxygen peroxide.

We convert the mass of oxygen to moles:50 g . 1mol /32g = 1.56 mol

Certainly oxygen is the limiting reactant.

2 moles of water react to 1 mol of oxygen.

13 moles of water may react to 13/2 = 6.5 moles. (And we only have 1.56)

As we determine the limiting reactant we continue to the products:

1 mol of O₂ can produce 2 moles of H₂O₂

Then 1.56 moles of O₂ will produce (1.56 . 2) = 3.125 moles

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That's the 100% yield or it can be called theoretical yield.

Percent yield = (Yield produced / Theoretical yield) . 100

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2 years ago
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