1. What is the correct number of significant figures in the following calculatio
ID: 486455 • Letter: 1
Question
1. What is the correct number of significant figures in the following calculation?
2. Which of the following ionic isotopes has the same number of neutrons and electrons?
a)75Br-1
b)77Y+1
c)25Al+3
d)33Zn+3
3.I would like to add carpet to all the floors in my house. If all the floors in my house measure 1,865 ft2, and the cost of carpet is $39.87 per m2, how much would it cost to cover my floors with carpet?
4. Copper has two isotopes, 63Cu and 65Cu. If the isotopic mass of 63Cu is 62.9296 amu, the isotopic mass of 65Cu is 64.9278 amu, and the atomic mass of Copper is 63.5462 amu, what is the % abundance of each isotope of copper?
5. Please fill in the missing information
Name Molecular Formula
Iron (III) Chloride _______________
______________ RuO3
Magnesium Nitride _______________
_______________ N3F5
Copper(I) Sulfide ________________
2.574 (21.84 -20.78) (25.478 5468) 7.125Explanation / Answer
1)
21.84 - 20.78 = 1.06
2.574/1.06= 2.43 (leat of the significant figure)
25.478 - 0.5468 = 24.931
24.931/7.125 = 3.499
so finally we have,
2.43 * 3.499 = 8.50
number of significant figure should be 3
Answer: 3
I am allowed to answer only 1 question at a time
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