How many moles are in 1.78 x 1050 atoms of Mg?

0.296×10²⁷ moles of Mg atoms.

Explanation:

Given data:

Number of moles of Mg = ?

Number of atoms = 1.78 ×10⁵⁰ atom

Solution:

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.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen

Number of moles of Mg atoms:

1.78 ×10⁵⁰ atom × 1 mol  /6.022 × 10²³ atoms

0.296×10²⁷ moles of Mg atoms.

the answer is either b or c

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.