Advertisements
Advertisements
प्रश्न
Which one of the following represents 180 g of water?
विकल्प
5 Moles of water
90 moles of water
`(6.022 xx 10^23)/180` molecules of water
6.022 × 1024 molecules of water
Advertisements
उत्तर
6.022 × 1024 molecules of water
Explanation:
No. of moles of water present in 180 g
= `"Mass of water"/"Molar mass of water"`
= `(180 "g")/(18 "g mol"^-1)`
= 10 moles
One mole of water contains = 6.022 × 1023 water molecules
10 mole of water contains = 6.022 × 1023 × 10
= 6.022 × 1024 water molecules
APPEARS IN
संबंधित प्रश्न
Calculate the molecular mass of the following in u.
CH3COOH
Solve problem:
Calculate the number of an atom of the following (Given: Atomic mass of I = 127 u).
254 g of iodine (I)
Solve problem:
Arjun purchased 250 g of glucose (C6H12O6) for Rs 40. Find the cost of glucose per mole.
Solve problem:
Calculate the number of atoms of the following. (Average atomic mass : N = 14 u, S = 32 u)
0.4 mole of nitrogen
Solve problem:
Calculate the mass of sulfur dioxide produced by burning 16 g of sulfur in excess of oxygen in the contact process. (Average atomic mass : S = 32 u, O = 16 u)
Explain the need of the term average atomic mass.
Which one of the following is used as a standard for atomic mass.
The reaction between aluminium and ferric oxide can generate temperatures up to 3273 K and is used in welding metals.
(Atomic mass of Al = 27 u Atomic mass of O = 16 u)
\[\ce{2Al + Fe2O3 -> Al2O3 + 2Fe}\]; If, in this process, 324 g of aluminium is allowed to react with 1.12 kg of ferric oxide.
- Calculate the mass of Al2O3 formed.
- How much of the excess reagent is left at the end of the reaction?
An element has a bee structure with cell edge of 288 pm. The density of element is 7.2 g cm-3. What is the atomic mass of an element?
Which symbol replaces the unit of atomic mass, amu?
