
Concept explainers
Interpretation:
The value of x in the molecular formula is to be calculated.
Concept introduction:
The ideal gas equation elaborates the physical properties of gases by relating the pressure, volume, temperature, and number of moles with each other with the help of four
PV=nRT
Here, n is the number of moles, R is the gas constant, T is the temperature, V is thevolume, and P is the pressure.
The formula for conversion of temperature from degree Celsius to Kelvin is represented as
T(K)=T(°C)+273.15

Answer to Problem 110AP
Solution: MgSO4.7H2O
Explanation of Solution
Given information:
Mass m=54.2 g
Pressure P=24.8 atm
Temperature T=120 °C
Volume V=2 L
The temperature is 120 °C.
The conversion of temperature from degree Celsius to Kelvin can be done by using the formula given below:
T(K)=T(°C)+273.15=(120+273.15)=393.15 K
The number of moles for 1 L of volume, that is, molar volume is
The equation for an ideal gas is as follows:
PV=nH2ORT
Rearrange the above equation for number of moles as follows:
nH2O=PVRT
Substitute 0.08206 L.atm/K.mol for R, 393.15 K for T, 24.8 atm for P, and 2 L for V in the above equation
nH2O=(24.8 atm)(2 L)(0.08206 L.atm/K.mol)(393.15 K)=(49.632.26) mol=1.537 mol nH2O=(24.8 atm)(2 L)(0.08206 L.atm/K.mol)(393.15 K)=(49.632.26) mol=1.537 mol
Calculate the mass of water as follows:
mH2O=nH2O×MH2O
Substitute 1.537 mol for nH2O and 18 g/mol for MH2O in the above equation
mH2O=1.537 mol×18 g/mol=27.6 g mH2O=1.537 mol×18 g/mol=27.6 g
The mass of thesample is thesum of mass of H2O and MgSO4, which is shown as follows:
msample=mH2O+mMgSO4
Rearrange the above equation for mMgSO4 as follows:
mMgSO4=msample−mH2O
Substitute 54.2 g for msample and 27.6 g for mH2O in the above equation
mMgSO4=54.2 g−27.6 g=26.4 g
Calculate the moles of MgSO4 as follows:
nMgSO4=mMgSO4MMgSO4
Substitute 26.4 g for mMgSO4 and 120.4 g/mol for MMgSO4 in the above equation
nMgSO4=26.4 g120.4 g/mol=0.22 mol nMgSO4=26.4 g120.4 g/mol=0.22 mol
Now, the mole ratio of H2O and MgSO4 is
nH2OnMgSO4=1.54 mol0.22 mol=7 nH2OnMgSO4=1.54 mol0.22 mol=7
As the mole ratio of H2O and MgSO4 is 7:1, the value of x in the compound MgSO4.xH2O will be 7.
So, the molecular formula of the compound is MgSO4.7H2O.
The value of x in the compound MgSO4.xH2O is 7.
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Chapter 10 Solutions
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