Question

a) Calculate the number of
molecules present in 4.4g ofCO2.
[At Mass: C=12, O=16 U, NA = 6.02
x1023 b) What are polyatomic ion?
Give one example.​

Answer 1

Answer:

one answer

Weight of CO2 in gram per moles=

=(12) + (16*2)

=12+32

=44 g/moles.

Now, for 4.4 grams of CO2, we get

4.4/44 = 0.1 moles

Now, number of molecules:-

0.1 * 6.022 * 10²³

= 0.6022 * 10²³

= 6.022 * 10²² molecules

Explanation:

two answer

Number of molecules in 4.4g

The ‘molar mass’ of carbon (C) = 12.011 g/mol

The ‘molar mass’ of oxygen (O) = 31.998 g/mol

Total ‘molar mass’ of  = 44.009 g/mol

Moles  

Moles  = 0.1 mol

Moles  = 0.1 mol

The formula for number of molecules  

Number of molecules in 4.4g of  =  

Number of molecules in 4.4g of  

The "number of molecules" in a known mass of an element or compound is calculated based on the fact that 'one mole of a compound ' contains  molecules and this number is the Avogadro constant.  

Answer 2

Answer:

A polyatomic ion, also known as a molecular ion, is a charged chemical species (ion) composed of two or more atoms covalently bonded or of a metal complex that can be considered to be acting as a single unit. ... Examples: Carbonate (CO32-), sulphate (SO42-), nitrate - NO3- and hydroxide ions OH- are all polyatomic ions.

Explanation:

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