Acid rain can form in a two-step process, producing HNO3(aq). N2(g) + 202(g) → 2NO3(g) 3NO2(g) + H2O(g) → 2HNO3(aq) + NO(g) a. A car burns 420. g of N according to the above equations. How many grams of HNO will be produced?
b. For the above reactions to occur, O must be in excess in the first step. What is the minimum amount of O needed in grams?
c. What volume does the amount of O in part b occupy if its density is 1.4 g/L?​

- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.