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College of Education college.education@chmsc.edu.ph (63-34) 712-0003 local 134
Alijis Campus | Binalbagan Campus | Fortune Towne Campus | Talisay Campus
To be a leading GREEN institution of higher learning in the global community by 2030
(Good governance, Research-oriented, Extension-driven, Education for Sustainable Development & Nation-building)
SANCHE Worksheet
Module 1:
Calculations Used in Analytical Chemistry
Important Units of Measurement
Do the Math! Young scientist, it’s time to use mathematical skills! Solve the following word
problems and show your complete process (Given-Required-Equation-Solution). Highlight with a
yellow marker all your final answers (ex. 2.75 m). Are you now ready to do the Math?
1) How many atoms are in each of the following samples?
a) 11.3 g Pb
b) 44.2 g Mg
c) 0.582 kg SiO
2
Given (a)
Req’d
Eq’n
Sol’n
Given (b)
Req’d
Eq’n
Sol’n
Given (c)
Req’d
Eq’n
Sol’n
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College of Education college.education@chmsc.edu.ph (63-34) 712-0003 local 134
Alijis Campus | Binalbagan Campus | Fortune Towne Campus | Talisay Campus
To be a leading GREEN institution of higher learning in the global community by 2030
(Good governance, Research-oriented, Extension-driven, Education for Sustainable Development & Nation-building)
2) Gold is one of the coinage metals (copper, silver, and gold). How many atoms of gold (Au)
are in a pure gold nugget having a mass of 34.0 g?
Given
Req’d
Eq’n
Sol’n
3) Helium is an unreactive noble gas that is used to inflate balloons. A party balloon contains
3.33 x 10
22
atoms of helium gas (He) gas. Find the mass in grams of helium.
Given
Req’d
Eq’n
Sol’n

### Unformatted Attachment Preview

Carlos Hilado Memorial State College Alijis Campus | Binalbagan Campus | Fortune Towne Campus | Talisay Campus To be a leading GREEN institution of higher learning in the global community by 2030 (Good governance, Research-oriented, Extension-driven, Education for Sustainable Development & Nation-building) College of Education college.education@chmsc.edu.ph (63-34) 712-0003 local 134 SANCHE Worksheet Module 1: Calculations Used in Analytical Chemistry Important Units of Measurement Do the Math! Young scientist, it’s time to use mathematical skills! Solve the following word problems and show your complete process (Given-Required-Equation-Solution). Highlight with a yellow marker all your final answers (ex. 2.75 m). Are you now ready to do the Math? 1) How many atoms are in each of the following samples? a) 11.3 g Pb b) 44.2 g Mg c) 0.582 kg SiO2 Given (a) m=11.3 g Req’d N of Pb Eq’n n=m/M N=nNA Sol’n n=11.3 g/207.2 g/mol n=0.0545 mol Pb N=0.0545 mol Pb(6.02x1023 atoms Pb/1 mol Pb) N=3.28x1022 atoms Pb Given (b) m=44.2 g Req’d N of Mg Eq’n n=m/M N=nNA Sol’n n=44.2 g/24.304 g/mol n=1.8186 mol Mg N=1.8186 mol Mg(6.02x1023 atoms Mg/1 mol Mg) N=1.09x1024 atoms Mg Given (c) Req’d Eq’n Sol’n m=0.582 kg N of SiO2 n=m/M N=nNA m=0.582 kg(1000 g/1 kg) m=582 g Carlos Hilado Memorial State College Alijis Campus | Binalbagan Campus | Fortune Towne Campus | Talisay Campus To be a leading GREEN institution of higher learning in the global community by 2030 (Good governance, Research-oriented, Extension-driven, Education for Sustainable Development & Nation-building) College of Education college.education@chmsc.edu.ph (63-34) 712-0003 local 134 Si=1(28.084)= 28.084 O=2(16)= 32.000 M=60.084 g/mol n=582 g/60.084 g/mol n=9.6864 mol SiO2 N=9.6864 mol SiO2(6.02x1023 atoms SiO2/1 mol SiO2) N=5.83x1024 atoms SiO2 2) Gold is one of the coinage metals (copper, silver, and gold). How many atoms of gold (Au) are in a pure gold nugget having a mass of 34.0 g? Given m=34.0 g Req’d N of Au Eq’n n=m/M N=nNA Sol’n n=34.0 g/196.97 g/mol n=0.1726 mol Au N=0.1726 mol Au(6.02x1023 atoms Au/ 1 mol Au) N=1.04x1023 atoms Au 3) Helium is an unreactive noble gas that is used to inflate balloons. A party balloon contains 3.33 x 1022 atoms of helium gas (He) gas. Find the mass in grams of helium. Given N=3.33x10^22 atoms He Req’d m Eq’n n=N/NA m=nM Sol’n n=3.33x1022 atoms He (1 mol He/6.02x1023 atoms He) n=0.0553 mol He m=(0.0553 mol)(4.0026 g/mol) m=0.22 g He Name: Description: ...
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