Given the reaction zn(s) + pb(no3)2 (aq) = pb(s) +zn (no3)2 (aq) the oxidation number of zn metal is
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Answer:
The amount of sodium is 32 mg per cracker, 49 mg per pretzel and 68 mg per cookie.
Explanation:
Let's assume amount of sodium is x mg per cracker, y mg per pretzel and z mg per cookie.
So, the following three equations can be written as per given information:
x+y+z = 149 ........(1)
8y+8z = 936 ........(2)
6x+7y = 535 .........(3)
From equation- (2), y+z = = 117
By substituting the value of (y+z) in equation- (1) we get,
x = 149-(y+z) = 149-117 = 32
By substituting the value of x into equation- (3) we get,
y = = 49
By substituting the value of y into equation- (2) we get,
z = (117-49) = 68
So, the amount of sodium is 32 mg per cracker, 49 mg per pretzel and 68 mg per cookie.
Start by writing the atoms balance:
Now, determine the change of oxidation states:
has oxidation state 0, so each N has to gain 3 electrons to become 
.
That, means that you need 6 electrons to balance the charges, resulting in:
And the answer is 6 mole of electrons.
Now, determine the change of oxidation states:
That, means that you need 6 electrons to balance the charges, resulting in:
And the answer is 6 mole of electrons.