A chemical reaction absorbs energy which means it is endothermic reaction.
The reaction is endothermic if the energy of products is more than the energy of reactants.
The energy of products is more means that the bond energy of products is more than the bond energy of reactants.
so breaking of bond needs energy which is greater than the energy released in making of new bonds.
Enthalpy of reaction = Bond energy of reactants - Bond energy of products.
Answer:
d≈ 1.15 g/cm^3
Explanation:
The density of an object can be found by dividing the mass over the volume.
d= m/v
The mass of the object is 54.3 grams and the volume is 47.18 cubic centimeters.
m= 54.3 g
v= 47.18 cm^3
Substitute the values into the formula.
d= 54.3 g/ 47.18 cm
Divide.
d= 1.150911403136922 g/cm^3
Let’s round to the nearest hundredth. The 0 in the thousandth place tells us to leave the 5 in the hundredth place.
d ≈ 1.15 g/cm^3
The density is about 1.15 grams per cubic centimeter.
There is a 2:1 ratio between H2 and O2. so for every mol of O2 used there would be 2 mol needed, so if we use 4 mol of O2 we multiply 4 by 2 to get 8 mol of H2 used in this reaction