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Hcl + Mg --> MgCl2 + H2 This equation has an unbalanced amount of atoms on each side. To work out the balanced formula you need to find the number of atoms of each side. There are: 1 Hcl + 1 Mg ---> 1Mg 2Cl + 2H Bear in mind you cannot change a "clump" of elements, as this changes the reaction (MgCl2). So, to get the equal number of atoms, you simply put in a number at the start of each "clump" to multiply it and even out, sort of like expanding a set of brackets in maths. In this equation we want to put a 2 in front of Hcl to multiply the Hydrogen atom and get 2 hydrogen atoms (therefore balancing with the left side). Doing so will then multiply the chlorine atoms by 2, giving 2 chlorine atoms. So now there are: 2Hcl + Mg --> MgCl2 + H2 (2 hydrogen atoms, 2 chlorine atoms, 1 magnesium atom on the left. one magnesium atom two chlorine atoms and 2 hydrogen atoms on the right) and that's it. the equation is balanced, easy as that... If you get it try this one, Na + H2O --> NaOH + H2. Answer will be down here.... ---- 2Na + 2H2O --> 2NaOH + H2

Q: Balance the formula example

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