Chemistry: Atoms First
Chemistry: Atoms First
2nd Edition
ISBN: 9780073511184
Author: Julia Burdge, Jason Overby Professor
Publisher: McGraw-Hill Education
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Chapter 11, Problem 11.84QP
Interpretation Introduction

Interpretation:

The molecular formula of the given compound has to be calculated.

Concept Introduction:

Ideal gas is the most usually used form of the ideal gas equation, which describes the relationship among the four variables P, V, n, and T.  An ideal gas is a hypothetical sample of gas whose pressure-volume-temperature behavior is predicted accurately by the ideal gas equation.

PV = nRT

The molar mass formula

M=mass(ing)mol

Expert Solution & Answer
Check Mark

Answer to Problem 11.84QP

Hence, the molecular formula is (PF2)2 orP2F4

If you determine the molar mass of the gas, you will be able to determine the molecular formula from the empirical formula.

Explanation of Solution

To calculate the moles of the compound.

n=PVRTn=(97.3mmHg×1atm760mmHg)(0.378L)(0.0821L.atmK.mol)(77+273)K=0.00168mol

The mole of the compound is calculated by plugging in the values of the given volume,

Pressure and temperature.  The moles of the compound was found to be 0.00168mol

To calculate the molar mass

M=massmol=0.2324g0.00168mol=138g/mol

The molar mass is calculated by plugging in the given weight of compound and moles of compound.  The molar mass was found to be 138g/mol

To calculate the empirical formula, first we need to find the mass of F in 0.2631 g of CaF.2

0.2631gCaF2×1molCaF278.08gCaF2×2molF1molCaF2=19.00gF1molF=0.1280gF

Since the compound only contains P and F, the mass of P in the 0.2324 g sample is:

0.2324 g-0.1280 g = 0.1044 g P

The mass of F in 0.2631 g of CaF2 is calculated by plugging in the given weight of compound and molecular weight of the compound.  The molar mass was found to be 0.1280gF and 0.1044 g P

We can convert masses of P and F to moles of each substance.

?molP=0.1044gP×1molP30.97gP=0.003371molP

?molF=0.1280gF×1molF19.00gF=0.006737molF

The moles of each substance are calculated by plugging in the given weight of compound and molecular weight of compound.  The moles of each substance was found to be 0.003371molP and0.006737molF

Thus, we arrive at the formula P0.003371F0.006737. Dividing by the smallest number of moles (0.003371mol) gives the empirical formula PF2.

To determine the molecular formula, divide the molar mass by the empirical mass.

molarmassempiricalmolarmass=138g68.97g2

Hence, the molecular formula is (PF2)2 orP2F4

Conclusion

The molecular formula of the given compound was calculated.

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Chapter 11 Solutions

Chemistry: Atoms First

Ch. 11.3 - Prob. 11.3.1SRCh. 11.3 - Prob. 11.3.2SRCh. 11.3 - Prob. 11.3.3SRCh. 11.3 - Prob. 11.3.4SRCh. 11.3 - Prob. 11.3.5SRCh. 11.4 - Prob. 11.3WECh. 11.4 - Prob. 3PPACh. 11.4 - Prob. 3PPBCh. 11.4 - Prob. 3PPCCh. 11.4 - Prob. 11.4WECh. 11.4 - Prob. 4PPACh. 11.4 - Prob. 4PPBCh. 11.4 - Prob. 4PPCCh. 11.4 - If we combine 3.0 L of NO and 1.5 L of O2, and...Ch. 11.4 - What volume (in liters) of water vapor will be...Ch. 11.4 - Prob. 5PPBCh. 11.4 - Prob. 5PPCCh. 11.4 - Prob. 11.6WECh. 11.4 - Prob. 6PPACh. 11.4 - Prob. 6PPBCh. 11.4 - Prob. 6PPCCh. 11.4 - Prob. 11.4.1SRCh. 11.4 - Prob. 11.4.2SRCh. 11.4 - Prob. 11.4.3SRCh. 11.4 - Prob. 11.4.4SRCh. 11.4 - Prob. 11.4.5SRCh. 11.4 - Prob. 11.4.6SRCh. 11.5 - Prob. 11.7WECh. 11.5 - Prob. 7PPACh. 11.5 - Prob. 7PPBCh. 11.5 - Prob. 7PPCCh. 11.5 - Prob. 11.8WECh. 11.5 - Prob. 8PPACh. 11.5 - Prob. 8PPBCh. 11.5 - Prob. 8PPCCh. 11.5 - Prob. 11.9WECh. 11.5 - Prob. 9PPACh. 11.5 - Prob. 9PPBCh. 11.5 - Prob. 9PPCCh. 11.5 - Prob. 11.5.1SRCh. 11.5 - Prob. 11.5.2SRCh. 11.5 - Prob. 11.5.3SRCh. 11.5 - Prob. 11.5.4SRCh. 11.6 - Prob. 11.10WECh. 11.6 - Prob. 10PPACh. 11.6 - Prob. 10PPBCh. 11.6 - Prob. 10PPCCh. 11.6 - Prob. 11.11WECh. 11.6 - Determine the excluded volume per mole and the...Ch. 11.6 - Prob. 11PPBCh. 11.6 - Prob. 11PPCCh. 11.6 - Prob. 11.6.1SRCh. 11.6 - Prob. 11.6.2SRCh. 11.7 - Prob. 11.12WECh. 11.7 - Prob. 12PPACh. 11.7 - Prob. 12PPBCh. 11.7 - Prob. 12PPCCh. 11.7 - Prob. 11.13WECh. 11.7 - Prob. 13PPACh. 11.7 - Prob. 13PPBCh. 11.7 - Prob. 13PPCCh. 11.7 - Prob. 11.7.1SRCh. 11.7 - Prob. 11.7.2SRCh. 11.7 - Prob. 11.7.3SRCh. 11.7 - Prob. 11.7.4SRCh. 11.7 - Prob. 11.7.5SRCh. 11.8 - Prob. 11.14WECh. 11.8 - Prob. 14PPACh. 11.8 - Prob. 14PPBCh. 11.8 - Prob. 14PPCCh. 11.8 - Prob. 11.15WECh. 11.8 - Prob. 15PPACh. 11.8 - Prob. 15PPBCh. 11.8 - Prob. 15PPCCh. 11.8 - Calcium metal reacts with water to produce...Ch. 11.8 - Prob. 16PPACh. 11.8 - Determine the volume of gas collected over water...Ch. 11.8 - Prob. 16PPCCh. 11.8 - Prob. 11.8.1SRCh. 11.8 - Prob. 11.8.2SRCh. 11.8 - Prob. 11.8.3SRCh. 11 - Prob. 11.1QPCh. 11 - Prob. 11.2QPCh. 11 - Prob. 11.3QPCh. 11 - Prob. 11.4QPCh. 11 - Prob. 11.5QPCh. 11 - Prob. 11.6QPCh. 11 - Prob. 11.7QPCh. 11 - Prob. 11.8QPCh. 11 - Prob. 11.9QPCh. 11 - Prob. 11.10QPCh. 11 - Prob. 11.11QPCh. 11 - The 235U isotope undergoes fission when bombarded...Ch. 11 - Prob. 11.13QPCh. 11 - Prob. 11.14QPCh. 11 - Prob. 11.15QPCh. 11 - Prob. 11.16QPCh. 11 - Prob. 11.17QPCh. 11 - Prob. 11.18QPCh. 11 - Prob. 11.19QPCh. 11 - Prob. 11.20QPCh. 11 - Prob. 11.21QPCh. 11 - Prob. 11.22QPCh. 11 - Prob. 11.23QPCh. 11 - Prob. 11.24QPCh. 11 - Prob. 11.25QPCh. 11 - Prob. 11.26QPCh. 11 - Prob. 11.27QPCh. 11 - Prob. 11.28QPCh. 11 - Prob. 11.29QPCh. 11 - Prob. 11.30QPCh. 11 - Prob. 11.31QPCh. 11 - A sample of air occupies 3.8 L when the pressure...Ch. 11 - Prob. 11.33QPCh. 11 - Prob. 11.34QPCh. 11 - Prob. 11.35QPCh. 11 - Prob. 11.36QPCh. 11 - Prob. 11.37QPCh. 11 - Prob. 11.38QPCh. 11 - A gaseous sample of a substance is cooled at...Ch. 11 - Prob. 11.40QPCh. 11 - Prob. 11.41QPCh. 11 - Prob. 11.42QPCh. 11 - Prob. 11.43QPCh. 11 - Prob. 11.44QPCh. 11 - Prob. 11.45QPCh. 11 - Prob. 11.46QPCh. 11 - Prob. 11.47QPCh. 11 - Prob. 11.48QPCh. 11 - Prob. 11.49QPCh. 11 - Prob. 11.50QPCh. 11 - Prob. 11.51QPCh. 11 - Prob. 11.52QPCh. 11 - Prob. 11.53QPCh. 11 - Prob. 11.54QPCh. 11 - Prob. 11.55QPCh. 11 - Prob. 11.56QPCh. 11 - Prob. 11.57QPCh. 11 - A certain anesthetic contains 64.9 percent C, 13.5...Ch. 11 - A compound has the empirical formula SF4. At 20C,...Ch. 11 - Prob. 11.60QPCh. 11 - Prob. 11.61QPCh. 11 - Prob. 11.62QPCh. 11 - Prob. 11.63QPCh. 11 - Write the van der Waals equation for a real gas....Ch. 11 - Prob. 11.65QPCh. 11 - Prob. 11.66QPCh. 11 - Prob. 11.67QPCh. 11 - Prob. 11.68QPCh. 11 - Prob. 11.69QPCh. 11 - Prob. 11.70QPCh. 11 - Prob. 11.71QPCh. 11 - Prob. 11.72QPCh. 11 - Prob. 11.73QPCh. 11 - Prob. 11.74QPCh. 11 - Prob. 11.75QPCh. 11 - Prob. 11.76QPCh. 11 - Prob. 11.77QPCh. 11 - Prob. 11.78QPCh. 11 - Prob. 11.79QPCh. 11 - Prob. 11.1VCCh. 11 - Prob. 11.2VCCh. 11 - Prob. 11.3VCCh. 11 - Prob. 11.4VCCh. 11 - Prob. 11.80QPCh. 11 - Prob. 11.81QPCh. 11 - Prob. 11.82QPCh. 11 - Prob. 11.83QPCh. 11 - Prob. 11.84QPCh. 11 - Prob. 11.85QPCh. 11 - Prob. 11.86QPCh. 11 - Prob. 11.87QPCh. 11 - Prob. 11.88QPCh. 11 - Ethanol (C2H5OH) bums in air: C2H5OH(l) + O2(g) ...Ch. 11 - Prob. 11.90QPCh. 11 - Prob. 11.91QPCh. 11 - Prob. 11.92QPCh. 11 - Prob. 11.93QPCh. 11 - Prob. 11.94QPCh. 11 - Prob. 11.95QPCh. 11 - Prob. 11.96QPCh. 11 - Prob. 11.97QPCh. 11 - Prob. 11.98QPCh. 11 - Prob. 11.99QPCh. 11 - Prob. 11.100QPCh. 11 - Prob. 11.101QPCh. 11 - Prob. 11.102QPCh. 11 - Prob. 11.103QPCh. 11 - Prob. 11.104QPCh. 11 - Prob. 11.105QPCh. 11 - Prob. 11.106QPCh. 11 - Prob. 11.107QPCh. 11 - Prob. 11.108QPCh. 11 - Prob. 11.109QPCh. 11 - A 180.0-mg sample of an alloy of iron and metal X...Ch. 11 - Prob. 11.111QPCh. 11 - Prob. 11.112QPCh. 11 - Prob. 11.113QPCh. 11 - Prob. 11.114QPCh. 11 - Prob. 11.115QPCh. 11 - Prob. 11.116QPCh. 11 - Prob. 11.117QPCh. 11 - Prob. 11.118QPCh. 11 - Prob. 11.119QPCh. 11 - Prob. 11.120QPCh. 11 - Prob. 11.121QPCh. 11 - Prob. 11.122QPCh. 11 - Prob. 11.123QPCh. 11 - Prob. 11.124QPCh. 11 - Prob. 11.125QPCh. 11 - Acidic oxides such as carbon dioxide react with...Ch. 11 - Prob. 11.127QPCh. 11 - Prob. 11.128QPCh. 11 - Prob. 11.129QPCh. 11 - Prob. 11.130QPCh. 11 - Prob. 11.131QPCh. 11 - Prob. 11.132QPCh. 11 - Prob. 11.133QPCh. 11 - Prob. 11.134QPCh. 11 - Prob. 11.135QPCh. 11 - Prob. 11.136QPCh. 11 - Prob. 11.137QPCh. 11 - Prob. 11.138QPCh. 11 - Prob. 11.139QPCh. 11 - Prob. 11.140QPCh. 11 - Prob. 11.141QPCh. 11 - At what temperature will He atoms have the same...Ch. 11 - Prob. 11.143QPCh. 11 - Prob. 11.144QPCh. 11 - Prob. 11.145QPCh. 11 - Prob. 11.146QPCh. 11 - Prob. 11.147QPCh. 11 - Prob. 11.148QPCh. 11 - Prob. 11.149QPCh. 11 - Prob. 11.150QPCh. 11 - Prob. 11.151QPCh. 11 - A 5.00-mole sample of NH3 gas is kept in a 1.92-L...Ch. 11 - Prob. 11.153QPCh. 11 - Prob. 11.154QPCh. 11 - Prob. 11.155QPCh. 11 - Prob. 11.156QPCh. 11 - Prob. 11.157QPCh. 11 - Prob. 11.158QPCh. 11 - Prob. 11.159QPCh. 11 - Prob. 11.160QPCh. 11 - Prob. 11.161QPCh. 11 - Determine the mole fraction of helium in a gaseous...Ch. 11 - Prob. 11.2KSPCh. 11 - Prob. 11.3KSPCh. 11 - Prob. 11.4KSP
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