How many Magnesium atoms are present in 10MgCl2?

10 atoms

Explanation:

 The compound given is:

                10MgCl₂

In this compound, we have the atoms:

 Mg and Cl;

An atom is the smallest indivisible particle of a substance. They are the smallest particle to take part in chemical reactions.

 The coefficient and subscript together determines the number of atoms.

  Mg - 10 atoms

  Cl  - 20 atoms

the leaf is an organ of a typical plant, and the main functions are to complete photosynthesis and allow the plant to exchange gas, just like how we have the respiratory system. leaves have the stomata, which collects maintains co2 and o2 levels. this is necessary for cell metabolism. the leaf also collects sunlight using chloroplasts. succinctly, leaves own a pivotal role in sustaining plant life.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.