Answer:
B. Cu + 4HNO3 → Cu(NO3)2 + 2H2O + 2NO2
Explanation:
Hello,
In this case, we should understand oxidizing agents as those substances able to increase the oxidation state of another substance, therefore, in B. reaction we notice that copper oxidation state at the beginning is zero (no bonds are formed) and once it reacts with nitric acid, its oxidation states raises to +2 in copper (II) nitrate, thus, in B. Cu + 4HNO3 → Cu(NO3)2 + 2H2O + 2NO2 nitritc acid is acting as the oxidizing agent.
Moreover, in the other reactions, copper (A.), sodium (C. and D.) remain with the same initial oxidation state, +2 and +1 respectively.
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in 6.0 years it will be 450.00 heart beats
in 6.00 years it will be 450.000 heart beats
in 6.000 years it will be 450.0000 heart beats
Explanation:
2+8+2+4+7=23, i think that should be the answer just add everything and multiply if you have to
C is the best answer for that. The outer shell has a full octet
