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3 years ago

Which of the following is a possible formula unit? (2 points) Select one: a. PbO b. Li2B c. Al2Pb3 d. ClO

Chemistry

1 answer:

storchak [24]3 years ago

7 0

Answer:

a. PbO.

Explanation:

The formula unit of a stable chemical compound should maintain that the overall charge of the compound is zero (not charged).

The formula unit of a compound is represented by the lowest ratio numbers of the ions forming the compound.

Choice a: is the right answer PbO

That lead is divalent cation Pb²⁺ and O is considered as a divalent anion O²⁻.

So, the formula unit contains Pb:O with a ratio of 1:1 (PbO)

Choice b: is a wrong choice Li₂B

The lithium cation is a monovalent cation Li¹⁺ and boron is a trivalent cation B³⁺, so we can not do that.

Choice c: is a wrong choice Al₂Pb₃

that Al is a trivalent cation Al³⁺ and Pb is a divalent cation Pb²⁺, so we can not do this for the two cations.

Choice d: is a wrong choice ClO

that Cl may act as Cl¹⁺ and O acts as O²⁻, so the right formula unit should be Cl₂O.

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Explanation :

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Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.

The given balanced ionic equation will be,

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In this equation, $Li^+\text{ and }OH^-$ are the spectator ions.

By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.

The net ionic equation will be,

$3Sr^{2+}(aq)+2PO_4^{3-}(aq)\rightarrow Sr_3(PO_4)_2(s)$

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