Answer:
A. because the wood is stored chemical energy and it is converting into heat energy
Answer: 
is the limiting reagent and 
is the excess reagent.
Explanation:
To calculate the moles :
The balanced chemical reaction is:
According to stoichiometry :
3 moles of require = 1 mole of
Thus 0.960 moles of will require=
of
Thus is the limiting reagent as it limits the formation of product and is the excess reagent as it is left.
Answer:
I am not quite sure about it, i think it is because of the fact that mercury has weight, when it is filled with mercury, it will expand a little bit.
Answer:
0.971
Explanation:
The pressure (P) in atmospheres (atm) the balloon was filled to will be
P = P1 +P2 + P3
where P1 is the pressure in atm of Helium (0.5 atm)
P2 is the pressure in atm of Nitrogen (X atm)
P3 is the pressure in atm of Hydrogen (0.4 atm)
The value of P2 provided in the question is in mmHg
To convert we have
1 atm = 760 mmHg
X atm = 54 mmHg
X = 54 × 1/760
X = 0.071 atm
Hence, P2 = 0.071 atm
Thus, from the formula earlier
P = 0.5 + 0.071 + 0.4
P = 0.971 atm
