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slamgirl [31]
3 years ago
12

I NEED HELP ASAP :)

Chemistry
1 answer:
White raven [17]3 years ago
4 0

C) \text{LiBr}_{3}

Explanations

Approach A: Comparison of the bonding atoms

What element(s) does each species comprise?

  • carbon monoxide- one metalloid, carbon, bonded to one nonmetal
  • oxygen- one nonmetal
  • lithium bromide- one metal and one nonmetal
  • ammonia- two nonmetals

Lithium bromide \text{LiBr}_{3} is the only substance that features a metal element bonded to a nonmetal element among all four species in the list. It takes significant differences in electronegativity for the bonding atoms in a binary compound to ionize and form an ionic compound. Therefore the species in question shall  contain at least one metal element bonded to one nonmetal.

Approach B: Comparison of melting points

Recall the physical state of the species under room temperature and pressure:

  • carbon monoxide- gas
  • oxygen- gas
  • lithium bromide- ?
  • ammonia- gas

Ionic bonds hold ions in an ionic compound in place with great degrees of rigidity. In contrast, covalent molecules adhere to each other with intermolecular interactions that are weaker by magnitudes. It's unlikely for ionic crystals to behave as gases under standard conditions. Thus A, B, D cannot be ionic compounds.

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alina1380 [7]

Mass of H₂ needed to react with O₂ : 1.092 g

<h3>Further explanation</h3>

The concentration of a substance can be expressed in several quantities such as moles, percent (%) weight / volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.

Reaction

O₂(g) + 2H₂(g) → 2H₂O(g)

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mol O₂(MW=32 g/mol) :

\tt \dfrac{8.75}{32}=0.273

From the equation, mol ratio of O₂ : H₂ = 1 : 2, so mol H₂ :

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Answer:

see notes below

Explanation:

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1 mole = 1 formula weight

<u>Moles to Grams and Grams to Moles</u>

Grams => Moles

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*Ask the question => How many formula weights are there in the given mass? => Results is always moles.

Moles => Grams

Given moles,  grams = moles given X formula weight

*Summary

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