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The answer is B I’m pretty sure
Answer:
Water-gas A mixture of carbon monoxide (CO) and hydrogen (H2) produced by passing steam over red-hot coke using the endothermic reaction C + H2O # CO + H2.
Explanation:
The Mass number is 65, Copper-65
To find the mass number you add the number of protons to the number of neutrons.
Answer:
19-73 70-65-46 78-59-86 84-64