Enter your answer in the provided box. Methanol (CH3OH) is an organic solvent and is also used as a fuel in some automobile engines. From the following data, calculate the standard enthalpy of formation of methanol. 2CH3OH(l) + 3O2(g) → 2CO2(g) + 4H2O(l) ΔH o rxn = −1452.8 kJ/mol

-477.4 kJ/mol

Explanation:

Let's consider the following thermochemical equation.

2 CH₃OH(l) + 3 O₂(g) → 2 CO₂(g) + 4 H₂O(l)  ΔH°rxn = −1452.8 kJ/mol

We can find the standard enthalpy of formation (ΔH°f) using the following expression.

ΔH°rxn = 2 mol × ΔH°f(CO₂(g)) + 4 mol × ΔH°f(H₂O(l)) - 2 mol × ΔH°f(CH₃OH(l)) - 3 mol × ΔH°f(O₂(g))

2 mol × ΔH°f(CH₃OH(l)) = 2 mol × ΔH°f(CO₂(g)) + 4 mol × ΔH°f(H₂O(l)) - ΔH°rxn - 3 mol × ΔH°f(O₂(g))

2 mol × ΔH°f(CH₃OH(l)) = 2 mol × (-393.5 kJ/mol) + 4 mol × (-285.8 kJ/mol) - (-1452.8 kJ) - 3 mol × 0 kJ/mol

ΔH°f(CH₃OH(l)) = -477.4 kJ/mol

relative humidity is a measure of the amount of moisture in the air relative to the total amount of moisture the air can hold.

so d

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.