Advertisements
Advertisements
प्रश्न
A 0.24 g sample of compound of oxygen and boron was found by analysis to contain 0.096 g of boron and 0.144 g of oxygen. Calculate the percentage composition of the compound by weight.
Advertisements
उत्तर
Sample Total weight of compound = 0.24 g
Weight of boron = 0.096 g,
Weight of oxygen = 0.144 g
Weight percent of boron = `("Mass of element"/"Mass of compound") xx 100`
= `(0.096/0.24) xx 100`
= 40%
Weight percent of oxygen = `(0.144/0.24) xx 100`
= 60%
APPEARS IN
संबंधित प्रश्न
Define the atomic mass unit.
An element with mass number 81 contains 31.7% more neutrons as compared to protons. Assign the atomic symbol.
An ion with mass number 37 possesses one unit of negative charge. If the ion contains 11.1% more neutrons than the electrons, find the symbol of the ion.
Define gram atomic mass of a substance. How much is the gram atomic mass of oxygen ?
Define atomic mass unit.
Explain the following:
An element has atoms with different mass numbers.
Write down the mass number of the atom having 20 neutrons and 15 protons.
Select the correct answer from the answer in the bracket to complete the sentence.
An atom with electronic configuration 2, 7 and mass number 19 will have ________ neutrons.
Give a reason for the following:
The mass number of an atom is slightly less than the actual atomic mass.
The sum of the numbers of protons and neutrons of an atom is called its ______
Relative atomic mass is otherwise known as ______.
Answer the following question using the data given below:
- Assertion: The Relative Atomic mass of aluminium is 27
- Reason: An atom of aluminium is 27 times heavier than 1/12th of the mass of the C – 12 atom.
Write the different types of isotopes of oxygen and their percentage abundance.
Calculate the % of oxygen in Al2(SO4)3. (Atomic mass: Al-27, O-16, S -32)
One electron is present in the outermost shell of the atom of an element X. What would be the nature and value of charge on the ion formed if this electron is removed from the outermost shell?
What are the postulates of Bohr’s model of an atom?
An atom having atomic mass number 13 has 7 neutrons. What is the atomic number of the atom?
If the atomic mass unit ‘u’ were defined to be `1/5 "th"` of the mass of an atom of C-12, what would be the atomic weight of nitrogen in amu or ‘u’ in this state? Atomic weight of N on the conventional scale is 14.
