Which should be the coefficient of hydrogen, H 2 , in the following equation in
ID: 880440 • Letter: W
Question
Which should be the coefficient of hydrogen, H2, in the following equation in order to make it balanced?
2 Al + 3 H2SO4 ---> Al2(SO4)3 + ? H2
Magnesium reacts with oxygen to form magnesium oxide and has the following balanced chemical equation: 2 Mg + O2 --> 2 MgO.
How many mole(s) of MgO are produced when 0.20 mole O2 reacts completely?
Determine the number of atoms for each element present in the following molecule: Mg(OH)2
Using the periodic table of elements, determine the molar mass for this molecule. Show your work.
Explanation / Answer
In the first reaction the moles of hydrogen are 3 then the reaction will be balanced.
i.e., 2Al + 3H2SO4------> Al2(SO4)+ 3H2
in the second case given that 2 Mg +O2---------> 2MgO.is the balanced equation
in the balanced reaction 1 mole of oxygen reacted and 2 moles of MgO given.
if 0.2 moles of oxygen reacted 0.2x2=0.4 moles of MgO is formed.
In Mg(OH)2 1 Mg, 2 O, &2 H atoms are present.
the molar mass of Mg(OH)2 is 1 x atomic mass of Mg+2 x atomic mass of O+2 x atomic mass of H
= 1 x 24.305+2 x 15.9994+2x1.008
=58.3198 g/mole
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