CHM 134 General Biochemistry I
Test 3, Fall season 2009 – Drs. Foy and Steel
Name
SOLUTIONS
1 . ( 2 points) Calculate the amount of moles in 0. forty one g ti..
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2 . ( 2 points) What is the mass of 5. 1 mol S?
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3. ( 2 points) A three or more. 6 g sample of lithium consists of how a large number of atoms?.
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some. (4 points) The thickness of iron is six. 87 g/cm3. Calculate the quantity of iron atoms present in a cube that has an edge of 3. 00 cm.
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5. (4 points) You have 0. 330 mole of every of the subsequent elements: End up being, B, Bayerischer rundfunk, Ba, and Bi. Which in turn sample provides the largest mass and so why?
Since all these samples have the same number of atoms (based on the moles) the sample while using heaviest atoms will have the greatest mass. Therefore, the bismuth (Bi) sample will have the greatest mass because its atoms have the very best atomic mass, about 209 g/mol.
6th. (4 points) Calculate the molar mass of Magnesium in grams/mol given the subsequent data (Show your complete calculation):
Isotope
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natural
plethora
isotope mass
(grams/mol)
24
78. 00%
23. 9858
25
twelve. 00%
24. 9858
twenty six
11. 01%
25. 9826
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Mg
Magnesium
Mg
several. (4 points) If an typical grain of rice includes a volume corresponding to 6. 0mm3, what is the volume of 2. 5 moles of rice reported in cu inches?
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8. (3 points) What mass of He contains the same number of atoms as five. 00 g Kr?.
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on the lookout for. (15 points) Complete the table of names and formulas.
Method
Name
Fe2(Cr2O7)3
iron (III) dichromate
NaCH3COO
Sodium acetate
SiCl4
silicon tetrachloride
Pb(OH)4
lead (IV) hydroxide
KClO3
potassium chlorate
GaPO4
gallium phosphate
KClO4
potassium perchlorate
CH3COOH
lactic acid
N2O5
dinitrogen pentaoxide
Al(CN)3
aluminum cyanide
Ca(NO3)2
calcium nitrate
SF6
sulfur hexafluoride
CrO
chrominum (II) oxide
RbCl
rubidium chloride
P4 S9...
