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Significance of a Molecular Formula

A compound of...

Question

A compound of potassium is assigned the formula $K_{2} C r_{2} O_{7}$
How many elements are there in this compound?

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Solution

There are total three elements in $K_{2} C r_{2} O_{7}$ as $K$ potassium, $C r$ chromium and $O$ oxygen.

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Similar questions

A compound of potassium is assigned the formula

K_{2} C r_{2} O_{7}

.

Give the formula of each of the ions in this compound?

Q. How many atoms are there in this compound having formula

K_{2} C r_{2} O_{7}

Q. Approximately how many moles of potassium permanganate,

K M n O_{4}

, are present in

40 g

of this compound? (Atomic weights:

K = 39; M n = 55; O = 16

)

Q. An element X from group 2 of the periodic table reacts with an element Y from group 17 to form a compound.

(a) What is the nature of the compound formed?
(b) State whether the compound formed will conduct electricity or not.
(c) Give the formula of the compound formed.
(d) What is the valency of element X?
(e) How many electrons are there in the outermost shell of an atom of element Y?

Q. There are three elements

E, F, G

with atomic numbers

19, 8

17

respectively.
Give the molecular formula of the compound formed between

E

G

and state the type of chemical bond in this compound?

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Significance of a Molecular Formula

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