cicinent, Compound, mixture Atomic mass is in the units of a) amu/atom, b) amu/m
ID: 711523 • Letter: C
Question
cicinent, Compound, mixture Atomic mass is in the units of a) amu/atom, b) amu/mol e) g/mol d) g/atom Calculate the following to the proper number of significant figures. 6, 7. a) 14.3505 + 2.65 = Loocb:n,00 b) (0250) 3.39x10)1 3084.5x lo Sian c) 8.6 x (1255 . 3.45 x 108]--thro36x10" Sgnf 8. Indicate whether each of the following represents element, compound, mixture, ato anion, or two of the above N elemea NHompoun 9. How many protons, neutron, and electrons are in "Fe 10. Name Give formulas for Copper() oxide lodic acid Sulfur hexafluoride 11.Explanation / Answer
6)
Atomic mass is in the units atomic mass unit per atom
Answer: a
7)
a) 14.3505 + 2.65 = 17.0005 = 17.00
in addition we have to rounded off the answer to least number of decimal points present in the original answer.
b) (0.2501)*(3.39*10^4) = 8478.39 = 8.4783 * 10^3 = 8.48 * 10^3 to 3 significant figures.
Answer must be rounded off to least number of significants present in the original number.
c) 8.6 * (1255 - 3.45 *108) = 7588.64 = 7.5886 * 10^3 = 7.6*10^3
Answer must be rounded off to least number of significants present in the original number.
8)
N - atom , N2 - molecule, NH3 - compound, NH4+ - cation, NaN3 - Compound
9) Fe+3
Fe atomic number = 26
Number of protons = 26 number of electrons = 23
Mass number of Fe = 56 then number of neutrons = 56 - 26 = 30
10)
P - Phosphorous
N2O5 - Di nitrogen Pentoxide
KClO4 - Potassium Chlorate
11)
Copper (I) oxide = Cu2O
Iodic Acid - HIO3
Sulphur HexaFluoride - SF6
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