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Rama09 [41]
3 years ago
13

Give a theoretical reason why lithium and oxygen combine in the ratio 2:1

Chemistry
1 answer:
V125BC [204]3 years ago
4 0
Lithium is in the first column of the periodic table and thus can only form one bond with another atom (its ion is Li+)

Oxygen can form two bonds (as in the dioxygen O2).

Hence if you conbine Li and O it has to be Li2O.
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2 nf3 + 225 kj -> n2 + 3f2 is it exothermic or endothermic
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Due to energy being a reactant instead of a product, the process is endothermic. The system must absorb a quantity of energy before it can react, so it must be an endothermic system.
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Three radioisotopes are being discussed in a chemistry class. Technetium-99m has a half-life of 6 hours. Rubidium-87 has a half-
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you record the sea temperature at 12 degrees North 45 degrees West to be 27.5 degrees Celcius the humidity to be very high and a
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3 years ago
Definition of enthalpy
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How many mL of a 1.48 M calcium hydroxide solution are needed to neutralize 36.0 mL of a 1.63 M hydrochloric acid solution
Lelechka [254]

The volume (in mL) of calcium hydroxide, Ca(OH)₂ needed for the reaction is 19.8 mL

<h3>Balanced equation </h3>

2HCl + Ca(OH)₂ —> CaCl₂ + 2H₂O

From the balanced equation above,

  • The mole ratio of the acid, HCl (nA) = 2
  • The mole ratio of the base, Ca(OH)₂ (nB) = 1

<h3>How to determine the volume of Ca(OH)₂ </h3>
  • Molarity of base, Ca(OH)₂ (Mb) = 1.48 M
  • Volume of acid, HCl (Va) = 36 mL
  • Molarity of acid, HCl (Ma) = 1.63 M
  • Volume of base, Ca(OH)₂ (Vb) =?

MaVa / MbVb = nA / nB

(1.63 × 36) / (1.48 × Vb) = 2

58.68 / (1.48 × Vb) = 2

Cross multiply

2 × 1.48 × Vb = 58.68

2.96 × Vb = 58.68

Divide both side by 2.96

Vb = 58.68 / 2.96

Vb = 19.8 mL

Learn more about titration:

brainly.com/question/14356286

#SPJ1

6 0
2 years ago
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