## anonymous one year ago how do i find the molar heat of a substance A sample of ethanol (C2H6O) has a mass of 0.2301 g. Complete combustion of this sample causes the temperature of a bomb calorimeter to increase by 1.33°C. The calorimeter has a mass of 2.000 kg and a specific heat of 2.45 J/g•°C. please go step by step

1. aaronq

You have to do this in two steps, first find the heat produced by the sample, using the information given and this equation: $$\sf q=m_{water}*C_p*\Delta T$$ Next, we'll convert the mass of the sample of ethanol to moles (moles is denoted by $$\sf n$$ in the equation below). We will use that and and the heat found in the first step. $$\sf q=\Delta H^o_{comb}* n\rightarrow \Delta H^o_{comb}=\dfrac{q}{n}$$

2. anonymous

wait what is the delta H?

3. arindameducationusc

This is what I think, The specific Heat formula $\Delta{Q}=mc \Delta{T}$ where c= Specific Heat Capacity $\Delta{Q}=$ Heat required for the temperature change or Thermal energy change $\Delta{T}=$ Change in Temperature m= Mass of the object Substituting numbers, you will get q. and after that put it in $q = n ΔH _{trans}$ where "trans" will be one of the following: fusion, freezing, evaporation, condensation, sublimation, or deposition

4. arindameducationusc

Substances not changing phase: q = m Cs ΔT (per gram) q = n Cm ΔT (per mol) Substances that are changing phase (transition): q = m ΔHtrans (per gram) q = n ΔHtrans (per mol)

5. arindameducationusc

$\Delta{H}=Enthalpy Change$

6. anonymous

ok thanks you helped alot