Answer:
d. at 25.0 and 1 atm
Explanation:
The standard heat of formation of a substance is the amount of heat absorbed or evolved when 1 mole of the substance is formed from from its constituent elements. It is also known as standard enthalpy of formation.
All elements in their natural states, have a standard heat of formation of zero because there is no temperature change involved in their formation. Example includes oxygen gas, graphite (solid carbon).
a. ΔH° of at standard pressure of 1 atm is zero, but not at 2 atm
b. ΔH° of Fe at 25.0 is zero, but not at 1200
c. ΔH° of is not zero because it's a compound
d. ΔH° of is zero at standard conditions
Answer:
It has 1 carbon atom and 4 hydrogen atoms
Explanation:
hope this helps :)
Answer:
B
Explanation:
the number of electrons is always equal the number of protons
amu - atomic number = no of neutrons
Answer:0.000000001
Explanation:you will move the decimal point 9 times to your left hand side