Questions requiring numerical answers must be accompanied by valid supporting ca
ID: 891365 • Letter: Q
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Questions requiring numerical answers must be accompanied by valid supporting calculations. All numerical answers must have the correct number of significant figures. Which of the following statements is true (T)? If ft statement is false (F), make it true. It is impossible for phosphorus and sulfur to be isotopic to each other. A 558.5 gram sample of iron contains twice as many atoms as 60.06 grams of carbon, Magnesium, manganese, and osmium are transition elements. An atom always has more subatomic particles than an ion. There are 6.02 Times 1023 molecules of NH3 in an 8.50 gram sample of NH3. Phosphorus-31, an uncharged isotope, has a total of forty-six subatomic particles. The formula for ammonium sulfide is (NH3)2SO3. The mass percent of nitrogen in ammonium nitrate is 35.00%. One mole of caffeine, C8H10O2N4, contains 6.02 Times 1024 hydrogen atoms. If an atomic particle carries a positive charge, then the atom has lost electrons. Using isotopic notation, write the atomic symbol for the element whose ion has the following properties; a +2 charge, 10% more protons than electrons, 26 neutrons. Antimony occurs in nature as a mixture of two isotopes: 123Sb and 121Sb. The isotope 121Sb has a mass of 120.9 amu and an abundance of 57.25%. Antimony has an average atomic mass of 121.75 amu. What is the abundance of the, 123Sb iasotope? What is the atomic mass of this isotope? A sample contains only carbon and hydrogen atoms. It is burned in oxygen producing 18.48 grams of CO2 and 6.30 grams of H2O. What is the simplest formula of the compound? How many grams of sample were burned? 1Explanation / Answer
a, f , h are correct true . remaining false
explanation for false:
(b) Fe molar mass = 55.845
Fe mass given = 558.5 g
Fe moles = mass / molar mass = 558.5 / 55.845 = 10 mol
like wise C moles = 60.06 / 12 = 5 mol
1 mol any compound contain ----------------> 6.023 x 10^23 atoms
moles are different in Fe and C . so atoms also different
(C) Mg is second group element . it is not tranisition element . remaining Mn and Os are transition elements
(d) may or may not cation less number of subatomic particles than atom . and anion more number of subatomic particles than atom
(e) NH3 moles = 8.5 / 17 =0.5 moles
0.5 moles contain atoms = 6. 02 x 10^23 x 0.5
(f) sorry . it is correct . true
(g) (NH4)2 S
(h) NH4NO3
N mass percent = 2 x 14 / 80 = 0.35 = 35 %
so it is also correct
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