How many molecules of HCl would react with 1 mole of Mg0?
Mg0 +2HCI
MgCl, + H,0

12.044 ×10²³ molecules of HCl

Explanation:

Given data:

Number of moles of MgO = 1 mol

Number of molecules of HCl react = ?

Solution:

Chemical equation:

MgO + 2HCl       →     MgCl₂  + H₂O

with 1 mole of MgO 2 moles of HCl are react.

Number of molecules of HCl react:

1 mole contain 6.022×10²³ molecules

2 mol × 6.022×10²³ molecules / 1 mol

12.044 ×10²³ molecules

b. examine and describe cells

yes the answer is total mass in unchanged   : )