Answer:
The concentration of nitrate ion
is 0.033 M.
Explanation:

1 mole of
= 3 mole 
Let
= 3y
then according to above reaction,
= y
= 0.10 M (given)
= ?
3y = 0.10 M

y = 0.033 M
So ,concentration of
= y = 0.033 M
I’m pretty sure it’s 150 joules
When HCl reacts with a metal, hydrogen gas will be evolved. To test this gas, insert a burning splinter into the outlet of gas, the flame will be extinguished with a pop sound. This will confirm the gas is hydrogen.