Answer:
I believe it is C.
Explanation:
Hope my answer has helped you and if not i'm sorry.
Given :
Initial concentration of nitric acid,
.
Final concentration of nitric acid,
.
Volume of
, 
To Find :
Volume needed(
).
Solution :
We know,

Hence, this is the required solution.
The steam rotates a turbine that activates a generator, which produces electricity. Many power plants still use fossil fuels to boil water for steam. Geothermal power plants, however, use steam produced from reservoirs of hot water found a couple of miles or more below the Earth's surface.
Answer:
Cr 6+ & SO4 2-
Explanation:
Sulfate is a polyatomic ion that has a charge of 2-. There are three of them in the chemical formula so it equates to a 6- total charge. Thus, chromium must have a 6+ charge to give the compound a neutral charge.