2.4 moles of NO, 2.4 moles of Oz, and 2.4 moles of H2O react
to form 2.0 moles of HNO3. What is the percent yield of this
reaction?

The idea here is that a reaction's percent yield tells you how many moles of a product will actually be produced by a chemical reaction for every  

100

moles of this product that could theoretically be produced by the reaction.

In your case, the reaction is said to have a percent yield of  

30

%

. This means that for every  

100

moles of a product that the reaction could produce, you will only get  

30

moles.

58 km per hour : d

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.