Answer:
Natural phenomena such as melting glaciers is due to the rise in temperature. This will result to extinction of flora and fauna. Moreover it can cause extreme flooding due to rise in water level in other water bodies such as rivers, lakes
Answer:
1.367 moles of Bi
Explanation:
a mole is 6.02 X 10^23 molecules of a substance
by dividing 
= 8.23/6.02 = 1.367 moles of Bi
Answer:
v2= 5.404L
Explanation:
using Boyle's law
p1 x v1 = p2 x v2
101.325 x 4.31 = 80.8 x v2
v2= (101.325 x 4.31)\80.8
v2= 5.404L
Answer:
Mass = 74.9 g
Explanation:
Given data:
Number of atoms of arsenic = 6.02×10²³ atoms
Mass of arsenic = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022× 10²³ is called Avogadro number.
one mole = 6.02×10²³ atoms
So number of moles of arsenic are 1 mol.
Mass of arsenic:
Mass = number of moles × molar mass
Mass = 1 mol × 74.9 g/mol
Mass = 74.9 g
Answer:
Na
Explanation:
The atomic number of sodium is 11 while that of fluorine is 9 . Thus the number of electrons in sodium are 11 while in fluorine are 9 .
The cation of an atom form when atom lose electron.
Na → Na⁺ + e⁻
it means the cation of sodium loses its one outer most electron. Thus it has 10 electron while Na atom has 11 electron.
On other hand fluorine has 9 electrons.
The anion of an atom form when it gain electron.
F + e⁻ → F⁻
Thus the number of electrons in given species are,
Na = 11
Na⁺ = 10
F = 9
F⁻ = 10
Na has more number of electrons.
