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(B) In water,$(H_2O)$,hydrogen and oxygen are always present in a fixed ratio by mass.The atomic mass of hydrogen is $1 	ext{ u}$ and the atomic mass

Vedclass · Accepted Answer

$1: 8$

Vedclass · Answer

(B) In water,$(H_2O)$,hydrogen and oxygen are always present in a fixed ratio by mass.The atomic mass of hydrogen is $1 	ext{ u}$ and the atomic mass of oxygen is $16 	ext{ u}$.In one molecule of water $(H_2O)$,there are $2$ atoms of hydrogen and $1$ atom of oxygen.Total mass of hydrogen $= 2 	imes 1 = 2 	ext{ u}$.Total mass of oxygen $= 1 	imes 16 = 16 	ext{ u}$.The ratio of the mass of hydrogen to the mass of oxygen is $2: 16$,which simplifies to $1: 8$.

Species property	$H_2O$	$CO_2$	$Na$ atom	$MgCl_2$
No. of moles	$2$	-	-	$0.5$
No. of particles	-	$3.011 \times 10^{23}$	-	-
Mass	$36 \, g$	-	$115 \, g$	-

In a compound such as water,the ratio of the mass of hydrogen to the mass of oxygen is always

Similar Questions

Fill in the missing data in the Table.
Species property $H_2O$ $CO_2$ $Na$ atom $MgCl_2$
No. of moles $2$ - - $0.5$
No. of particles - $3.011 \times 10^{23}$ - -
Mass $36 \, g$ - $115 \, g$ -

Calculate the number of atoms in:
$(i)$ $0.02$ moles of carbon
$(ii)$ $30$ grams of carbon
$(iii)$ $6$ moles of aluminium ions.

$(a)$ An atom is considered electrically neutral. Explain.
$(b)$ State the valency of Helium.
$(c)$ If an atom has an atomic mass of $4$ and $2$ protons in its nucleus,how many neutrons does it have?

Calculate the number of molecules in $0.5$ mole of water.

Name the international organisation which approves the names given to the elements. Write the symbol of tungsten.

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