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Name: ANSWER D MOLAR MASS: What is the molar mass of …rleano/docs/CHEM001/Worksheet07_… · It...
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WORKSHEET#7 examples, CHEM001 (Chapter 7) Name: ____________________________ Date: ___________________ 1. MOLAR MASS: What is the molar mass of MgSO 4 * 6H 2 O? 2. PERCENT OF ONE ELEMENT: What percent of the molar mass of H 2 SO 4 is made up by oxygen? How many grams of oxygen are contained in 12 grams of H 2 SO 4 ? 3. CONVERSION MAP: How many atoms of hydrogen are contained in 17 g of C 4 H 10 ? Page 1 of 1 { mmmm - mmmm mmmm z Approximate atomic masses to hundredths place ( two decimal places ) ! , hmm www.wwwwwwww ANSWER HEY 114¥ -111%06 ) -14116.001 + 12/1.01 ) t 646.00 ) = 228.37 glmal - - H O molar mass H2S 04 = 211.01 ) -11132.06 ) -1446.00) = 98.06 glmol Tt T -0 446.00 ) = 0.65266 → 65% 98.06 ( 0.65142g ) = 7.8g oeygen molar mass of Cy Hyo = 442.01 ) t 1011.01 ) = 58.10 glmd 1 mot × 6.022×7023 molecules 10 H atoms 17g × x 1.8×1024 atoms 58.01g 1 mot 1 molecule =
Transcript of Name: ANSWER D MOLAR MASS: What is the molar mass of …rleano/docs/CHEM001/Worksheet07_… · It...
WORKSHEET#7 examples, CHEM001 (Chapter 7)
Name: ____________________________ Date: ___________________
1. MOLAR MASS: What is the molar mass of MgSO4 * 6H2O?
2. PERCENT OF ONE ELEMENT: What percent of the molar mass of H2SO4 is made up by oxygen? How many grams of oxygen are contained in 12 grams of H2SO4?
3. CONVERSION MAP: How many atoms of hydrogen are contained in 17 g of C4H10?
Page 1 of 1
{mmmm - mmmm mmmm
zApproximate atomic masses to hundredths place ( two decimal places) !
,hmm www.wwwwwwww
ANSWER HEY
114¥-111%06)-14116.001 +
12/1.01) t 646.00) = 228.37 glmal-
-H O
molar mass H2S04 =211.01) -11132.06) -1446.00) = 98.06 glmolTt T -0446.00)
= 0.65266 → 65%98.06
(0.65142g) = 7.8g oeygen
molar mass of Cy Hyo =
442.01) t
1011.01) =
58.10glmd
1 mot×
6.022×7023 molecules 10 H atoms
17g × x 1.8×1024 atoms
58.01g
1 mot 1 molecule=
WORKSHEET#7, CHEM001 (Chapter 7)
Name: ____________________________ Date: ___________________
1. MOLAR MASS: What is the molar mass of BaCl 2 * 2H2O?
2. PERCENT OF ONE ELEMENT: What percent of the molar mass of CuSO4 is made up by oxygen? How many grams of oxygen are contained in 54 grams of CuSO4?
3. CONVERSION MAP: (7-22) How many atoms of hydrogen are contained in 57 g of C6H5 ONH2?
Page 1 of 2
{mmmm - mmmm mmmm
zApproximate atomic masses to hundredths place ( two decimal places) !
,hmmm www.wwwwwwww
ANSWER HEY
( IO min )
¥43334"tlfft=
244.28glmd
( 10 min )
446.00 )1- (63.541+1132.06)+446.00)
= 0.401 ⇒ 40 Yo
↳ 159.60 glmal
(54g) ( 0.401 ) = 21.7 "% 22g
( 10min )
molecular mass CGHSONHZ = 642.01)
-17-(1.07-1146.00)
-1144.01) =
109.14glmalT It TT
gag × ×6.022×1023 molecules
×7 hydrogen
= 2.2×1024 hydrogen atoms109.07g I mot I molecule
4. EMPIRICAL/MOLECULAR FORMULA: (7-48) A compound is composed of 54.5% C,
9.2% H, and 36.3% O. It has a molar mass of 88.11 g/mol. Determine the empirical and molecular formulas for this substance.
5. EMPIRICAL/MOLECULAR FORMULA: (7-44) A compound is composed of 29.73% C, 4.16% H, 13.20% O, and 52.91% S. It has a molar mass of 242.4 g/mol. Determine the empirical and molecular formulas for this substance.
Page 2 of 2
( IO min )
C :
54.5/12.01
=
4.541/2.27
= 2
H :
9.2/1.01
=
9.2/2.27= 4
O :
36.3/16.00= 2.27/2.27 =L
empirical : ( 2h40 → molar mass = 242.01 ) -1411.00 ) -1146.00 ) = 44.02 glmal88.11/44.02a 2 ⇒ 2C 02h40 )
molecular : CyHq02
( IO min )
I
C :
29.73/12.01--2.47/0.825
= 3
H :
4.16/1.01= 4.120.825 = 5
O :
13.20/16.00=
0.825/0.825--1
S :
52.91/32.06
=
1.65/0.825=2
empirical : Cz Hs 052
Tmolar mass -
- 342.01 ) -1511.00) -1146.00 ) -12132.06 ) = 121.15 glmol
242 glmol 1121.15 glmol a 2 ⇒ 2 ( Cs Hsosz )
molecular : C gtfo 0254
