Perform the Indicated Operation. (-18)-(4)
2 answers:
Answer:
-22
Step-by-step explanation:
(-18)-(4)
We apply the rule of sign when we add or subtract the numbers.
When the signs of two numbers are same then we add the numbers and put the same sign. When the signs of two numbers are not same then we subtract the numbers and put the sign of greatest number.
negative and positive becomes negative
The signs are same so we add the numbers and put the same sign.
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The emf of a cell is mathematically given as
= 0.0532 v
Generally, the equation for emf is mathematically given as
where,
Pb is lead
H is hydrogen
/ Pb has a standard reduction potential of -0.126 volts, while
/
has a standard reduction potential of 0.0 volts.
= 0.126 - 0.059/2 log 1 / [0.57] x [0.09]^2
= 0.0532 v
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