Answer: 78.3 torr
Explanation:
According to Raoult's law, the vapor pressure of a component at a given temperature is equal to the mole fraction of that component multiplied by the vapor pressure of that component in the pure state.
and ![p_2=x_2P_2^0](https://tex.z-dn.net/?f=p_2%3Dx_2P_2%5E0)
where, x = mole fraction
in solution
= pressure in the pure state
According to Dalton's law, the total pressure is the sum of individual pressures.
![p_{total}=p_1+p_2](https://tex.z-dn.net/?f=p_%7Btotal%7D%3Dp_1%2Bp_2)
![p_{total}=x_Ap_A^0+x_BP_B^0](https://tex.z-dn.net/?f=p_%7Btotal%7D%3Dx_Ap_A%5E0%2Bx_BP_B%5E0)
moles of ethanol= ![\frac{\text{Given mass}}{\text {Molar mass}}=\frac{80g}{46g/mol}=1.7moles](https://tex.z-dn.net/?f=%5Cfrac%7B%5Ctext%7BGiven%20mass%7D%7D%7B%5Ctext%20%7BMolar%20mass%7D%7D%3D%5Cfrac%7B80g%7D%7B46g%2Fmol%7D%3D1.7moles)
moles of methanol= ![\frac{\text{Given mass}}{\text {Molar mass}}=\frac{97g}{32g/mol}=3.0moles](https://tex.z-dn.net/?f=%5Cfrac%7B%5Ctext%7BGiven%20mass%7D%7D%7B%5Ctext%20%7BMolar%20mass%7D%7D%3D%5Cfrac%7B97g%7D%7B32g%2Fmol%7D%3D3.0moles)
Total moles = moles of ethanol + moles of methanol = 1.7 +3.0 = 4.7
,
,
![p_{ethanol}^0=44.6torr](https://tex.z-dn.net/?f=p_%7Bethanol%7D%5E0%3D44.6torr)
![p_{methanol}^0=97.7torr](https://tex.z-dn.net/?f=p_%7Bmethanol%7D%5E0%3D97.7torr)
![p_{total}=0.36\times 44.6+0.64\times 97.7=78.3torr](https://tex.z-dn.net/?f=p_%7Btotal%7D%3D0.36%5Ctimes%2044.6%2B0.64%5Ctimes%2097.7%3D78.3torr)
Thus the vapor pressure of a mixture of 80 g of ethanol and 97 g of methanol at 293 K is 78.3 torr.
Part 1: Potassium, and Rubidium.Part 2: Calcium has 20 protons and 20 electrons because the atomic number for calcium is 20 and that determines how many protons there are and in an atom, the number of protons is the same number of electrons. Calcium has about 20 neutrons. I got the number of Neutrons by subtracting the mass number(40.078) and the atomic number(20), I got 20.078. Round to the nearest whole number because you cannot have half or partial neutron. So, Calcium has 20 protons, 20 electrons, and 20 neutrons,
Hope this helps and please mark as brainliest!
Answer:
The heat capacity of the calorimeter or of the reaction mixture may be used to calculate the amount of heat released/absorbed by the chemical reaction. The amount of heat released or absorbed per gram or more of the reactant can then be calculated from the mass of the reactants.
-Quinn
A very disgusting type of lemonade