Answer:
77.98 g/mol ≅ 78.0 g/mol.
Explanation:
- The molar mass of any compound can be calculated by the sum of the atomic masses of different atoms in the compound multiplied by its no. in the compound.
Molar mass of Al(OH)₃ = (Atomic mass of Al) + 3(Atomic mass of O) + 3(Atomic mass of H)
Atomic mass of Al = 26.98 g/mol. & Atomic mass of O = 16.0 g/mol & Atomic mass of H = 1.0 g/mol.
<em>∴ Molar mass of Al(OH)₃</em> = (26.98 g/mol) + 3(16.0 g/mol) + 3(1.0 g/mol) = <em>77.98 g/mol ≅ 78.0 g/mol.</em>
Answer: they both contain the same metal(calcium)
Explanation: calcium burns with a characteristic orange color.
<u>Answer:</u> The number of electrons in given amount of silver are
<u>Explanation:</u>
The number of moles is defined as the ratio of the mass of a substance to its molar mass.
The equation used is:
......(1)
We are given:
Mass of silver = 7.0 g
Molar mass of silver = 107.87 g/mol
Putting values in equation 1:
According to the mole concept:
1 mole of a compound contains number of particles.
Number of electrons per atom of silver = 47
So, 0.065 moles of silver will contain = number of electrons
Hence, the number of electrons in given amount of silver are
<em>Assertion is correct statement but reason is wrong statement.</em>
<em>Assertion is correct statement but reason is wrong statement.Matter can neither be created nor destroyed is a statement of the law of conservation of mass.</em>
<em>Matter can neither be created nor destroyed is a statement of the law of conservation of mass.The assertion is correct but the reason is incorrect.</em>
The answer is A. More active than lithium -hope this helps.