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A 30.2-gram sample of an unknown compound contains 23.8 grams of tin and 6.4 grams of oxygen. What is the compound's empirical formula?

A 30.2-gram sample of an unknown compound contains 23.8 grams of tin and 6.4 grams of oxygen. What is the compound's empirical formula?

Chemistry for Engineering Students
Chemistry for Engineering Students
4th Edition
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter3: Molecules, Moles, And Chemical Equations
Section: Chapter Questions
Problem 3.95PAE: 3.95 Cumene is a hydrocarbon, meaning that it contains only carbon and hydrogen. If this compound is...
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A 30.2-gram sample of an unknown compound contains 23.8 grams of tin and 6.4 grams of oxygen. What is the compound's empirical formula?
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Step 1
The atomic mass of Cl is 35.45 amu. What is the mass in grams of 3 mol of Cl atoms?



Silber4 3.001b.EOCP.
The atomic mass of Al is 26.98 amu. What is the mass in grams of 2 mol of Al atoms?



Silber4 3.002a.EOCP.
How many moles of C atoms are in 1 mol of sucrose (C12H22O11)?



Silber4 3.002b.EOCP.
How many C atoms are in 1 mol of sucrose (C12H22O11)?



Silber4 3.003.AP. ,
Why might the expression "1 mole of nitrogen" be confusing?
Key: "1 mole of nitrogen" could be interpreted as a mole of nitrogen atoms or a mole of nitrogen molecules.

What change would remove any uncertainty?
Key: Specify a mole of nitrogen atoms or a mole of nitrogen molecules to avoid confusion.

For what other elements might a similar confusion exist? (Select all that apply.)

Why?
Key: The same problem is possible with other diatomic or polyatomic molecules, e.g., Cl2, Br2, S8, P4.



Silber4 3.003.EOCP.
"One mole of nitrogen" can be interpreted as one mole of nitrogen atoms or one mole of nitrogen molecules.



Silber4 3.004.EOCP.
Which is true for molecular mass and/or molar mass?



Silber4 3.005.EOCP.
Which is not true about the mole?



Silber4 3.007.AP.
Each of the following balances weighs the indicated numbers of atoms of two elements. Each part (a), (b), etc below refers to the corresponding balance.

(a) Which element has the lower molar mass?
 
 

(b) Which element has fewer atoms per gram?
 
 

(c) Which element has fewer atoms per gram?
 
 

(d) Which element has more atoms per mole?
 
 



Silber4 3.007a.EOCP.
Each of the balances below weighs the indicated numbers of atoms of two elements.

On Scale (a) which element has the higher molar mass?



Silber4 3.007b.EOCP.
Each of the balances below weighs the indicated numbers of atoms of two elements.

On Scale (b) which element has more atoms per gram?



Silber4 3.007c.EOCP.
Each of the balances below weighs the indicated numbers of atoms of two elements.

On Scale (c) which element has fewer atoms per gram?



Silber4 3.007d.EOCP.
Each of the balances below weighs the indicated numbers of atoms of two elements.

On Scale (d) which element has fewer atoms per gram?



Silber4 3.008.AP.
Calculate the molar mass of each of the following.
(a) SO2
[64.1] g/mol
(b) N2O
[44] g/mol
(c) K2S
[110] g/mol
(d) C6H12O6
[180] g/mol



Silber4 3.008a.EOCP.
Calculate the molar mass of the compound:
Sr(OH)2



Silber4 3.008b.EOCP.
Calculate the molar mass of the compound:
N2O



Silber4 3.008c.EOCP.
Calculate the molar mass of the compound:
NaClO3



Silber4 3.008d.EOCP.
Calculate the molar mass of the compound:
Cr2O3



Silber4 3.009.AP.
Calculate the molar mass of the following substances.
(a) K2C4H4O5
[210] g/mol
(b) P4O6
[220] g/mol
(c) CuSO4 · 5 H2O
[250] g/mol
(d) Na2HPO4
[142] g/mol



Silber4 3.009a.EOCP.
Calculate the molar mass of the compound:
(NH4)3PO4



Silber4 3.009b.EOCP.
Calculate the molar mass of the compound:
CH2Cl2



Silber4 3.009c.EOCP.
Calculate the molar mass of the compound:
CuSO4 · 5 H2



Silber4 3.009d.EOCP.
Calculate the molar mass of the compound:
BrF5



Silber4 3.010a.EOCP.
Calculate the molar mass of the compound:
SnO2



Silber4 3.010b.EOCP.
Calculate the molar mass of the compound:
BaF2



Silber4 3.010c.EOCP.
Calculate the molar mass of the compound:
Al2(SO4)3



Silber4 3.010d.EOCP.
Calculate the molar mass of the compound:
MnCl2



Silber4 3.011.AP.
Calculate the molar mass of each of the following.
(a) SrH2
[89.6] g/mol
(b) Fe(ClO4)3
[354] g/mol
(c) C7H8
[106] g/mol
(d) CuCl2 · 2 H2O
[170] g/mol



Silber4 3.011a.EOCP.
Calculate the molar mass of the compound:
N2O4



Silber4 3.011b.EOCP.
Calculate the molar mass of the compound:
C8H10



Silber4 3.011c.EOCP.
Calculate the molar mass of the compound:
MgSO4 · 7 H2O



Silber4 3.011d.EOCP.
Calculate the molar mass of the compound:
Ca(C2H3O2)2



Silber4 3.012.AP.
Calculate each of the following quantities.
(a) mass in grams of 0.67 mol KMnO4
WebAssign will check your answer for the correct number of significant figures. [110] g
(b) moles of O atoms in 7.56 g Mg(NO3)2
WebAssign will check your answer for the correct number of significant figures. [0.306] mol
(c) number of O atoms in 6.0  10-3 g CuSO4 · 5 H2O
WebAssign will check your answer for the correct number of significant figures. [1.3e+20] atoms



Silber4 3.012a.EOCP.
Calculate the mass in grams of 0.57 mol of KMnO4.



Silber4 3.012b.EOCP.
Calculate the moles of O atoms in 8.18 g of Mg(NO3)2.



Silber4 3.012c.EOCP.
Calculate the number of O atoms in 8.1  10-3 g of CuSO4 · 5 H2O.



Silber4 3.013.AP.
Calculate each of the following quantities.
(a) mass in kilograms of 3.4  1020 molecules of NO2
WebAssign will check your answer for the correct number of significant figures. [2.6e-05] kg
(b) moles of Cl atoms in 0.0535 g C2H4Cl2
WebAssign will check your answer for the correct number of significant figures. [0.00108] mol
(c) number of H - ions in 5.39 g SrH2
WebAssign will check your answer for the correct number of significant figures. [7.24e+22] ions



Silber4 3.013a.EOCP.
Calculate the mass in kilograms of 3.8  1020 molecules of NO2.



Silber4 3.013b.EOCP.
Calculate the moles of Cl atoms in 0.0425 g of C2H4Cl2.
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