L
Lindsayy.
Guest
Alright, so i did these problems for Chemistry and i need to know if they are right. So if you are good at chemistry, your help is greatly appreciated!
Part 1:
Identify the correct number of significant figures in each of the following measurements.
1) 2.31 m
2) 407 s
3) 0.02 L
4) 4500 mg
5) 8700.00 cm
6) 706.0200 g
Part 2:
Do the following calculations using correct significant figures and units.
1) 45.367 m + 4.3 m
2) 23.25 g / 5.0 mL
3) 35.67 s - 21.3456 s
4) 2.0 cm x 3.45 cm x 5.6789 cm
5) (2.34 m + 3.6754 m) x (2.11 m + 2 m)
Part 3:
Solve the following problems.
1) Another element - Z - has three isotopes: Z-78 with a weight of 77.989, Z-81 with a weight of 81.000, and Z-82 with a weight of 82.003. The percent abundance of the three isotopes is: Z-78 34.050%, Z-81 50.720%, and Z-82 15.230%. What is the average atomic weight of element Z?
2) A gaseous element has two isotopes: G-102 with an atomic weight of 102.11 and G-108 with an atomic weight of 108.08. The percent abundance of the heavier isotope is 34.550%. What is the average atomic weight of element G?
3) Barium has four isotopes: Ba-130, Ba-133, Ba-137 and Ba-139. The percent abundance of the isotopes are 16.06%, 12.44%, 45.57% with the rest being composed of the heaviest isotope. Masses are 129.9860 grams, 133.0002 grams, 137.0265 grams, and 139.4511 grams, respectively. What should be the reported average atomic weight of barium?
4) A certain metallic element has two stable isotopes: M-45 and M-48. Given that the atomic weights are 45.0010 and 48.0014, respectively, what is the percent abundance of the lighter isotope if the average atomic weight of M is 47.2002?
ANSWERS I GOT:
Part 1:
1) 3
2) 3
3) 1
4) 2
5) 4
6) 5
Part 2:
1) 49.7 m
2) 4.7 g/mL
3) 14.32 s
4) 39 cm3
5) 2 m2
Part 3:
1) 80.2
2) 104.2
3) 136.03 g
4) .2667 or 26.67%
Part 1:
Identify the correct number of significant figures in each of the following measurements.
1) 2.31 m
2) 407 s
3) 0.02 L
4) 4500 mg
5) 8700.00 cm
6) 706.0200 g
Part 2:
Do the following calculations using correct significant figures and units.
1) 45.367 m + 4.3 m
2) 23.25 g / 5.0 mL
3) 35.67 s - 21.3456 s
4) 2.0 cm x 3.45 cm x 5.6789 cm
5) (2.34 m + 3.6754 m) x (2.11 m + 2 m)
Part 3:
Solve the following problems.
1) Another element - Z - has three isotopes: Z-78 with a weight of 77.989, Z-81 with a weight of 81.000, and Z-82 with a weight of 82.003. The percent abundance of the three isotopes is: Z-78 34.050%, Z-81 50.720%, and Z-82 15.230%. What is the average atomic weight of element Z?
2) A gaseous element has two isotopes: G-102 with an atomic weight of 102.11 and G-108 with an atomic weight of 108.08. The percent abundance of the heavier isotope is 34.550%. What is the average atomic weight of element G?
3) Barium has four isotopes: Ba-130, Ba-133, Ba-137 and Ba-139. The percent abundance of the isotopes are 16.06%, 12.44%, 45.57% with the rest being composed of the heaviest isotope. Masses are 129.9860 grams, 133.0002 grams, 137.0265 grams, and 139.4511 grams, respectively. What should be the reported average atomic weight of barium?
4) A certain metallic element has two stable isotopes: M-45 and M-48. Given that the atomic weights are 45.0010 and 48.0014, respectively, what is the percent abundance of the lighter isotope if the average atomic weight of M is 47.2002?
ANSWERS I GOT:
Part 1:
1) 3
2) 3
3) 1
4) 2
5) 4
6) 5
Part 2:
1) 49.7 m
2) 4.7 g/mL
3) 14.32 s
4) 39 cm3
5) 2 m2
Part 3:
1) 80.2
2) 104.2
3) 136.03 g
4) .2667 or 26.67%