For the equation 3Cu+8⁢HNO_3→3Cu(NO_3)_2+2NO+4⁢H_2O , how many units of NO sub 3 are represented on the products side?

On the products side, the compound Cu(NO₃)₂ contains 2 NO₃ units per formula unit. Its coefficient is 3, so the total is 3 × 2 = 6 NO₃ units. The correct choice is C, 6.

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