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Practice ProblemBUILD
For which of the following molecular formulas is the formula shown in parentheses the correct empirical formula?
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Chemistry
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- QUESTION 1 What are the following? In each case, give a short answer. Two examples are given below: Example 1: 'H, ?н, Эн Isotopes of hydrogen Example 2: Ammeter A device for measuring electrical current (а) А (b) kg m² s-2 h (c) Ax. A(mv) 2 (d) Bond length (е) п, — ng (in the H atom) (f) 6.626 × 10~34 Js (g) 1 amu = 1.6605 × 10¬24 g (h) AE=hc (i) kg 6) E, = -2.179 × 10¬18 J (k) NA = 6.022 × 10²3 mol¯1 (1) A multiple bond (m) Radiation with A = 400 - 700 nm (n) Hertz (Hz) (0) c = 2.9979 × 10* m/s (p) X-rays, microwaves, UV lightarrow_forwardChoose the correct empirical formula corresponding to each of the following molecular formulas. (a) S4N4 (b) C7H15 (c) P4O6arrow_forwardCircle the best correct answer for the following multiple choice questions: 1) How many aluminum atoms are there in 3.50 grams of Al2O3? (а) 2.45 х 1022 (b) 2.07 х 1022 (с) 1.68 х 1022 (d) 4.90 х 1022 (е) 4.13 х 1022 2) What mass of cerussite, P6CO3, would contain 35.0 grams of lead? (a) 51.7 g (b) 42.4 g (c) 35.6 g (d) 45.1 g (e) 27.1 garrow_forward
- How many atoms or ions of each element are in 164.5 g of the following substances? (a) H2 × 1025 H atoms (b) Ca(NO3)2 × 1023 Ca2+ ions × 1024 NO3− ions (c) N2O2 × 1024 N atoms × 1024 O atoms (d) K2SO4 × 1024 K+ ions × 1023 SO42− ionsarrow_forwardRubidium has two naturally occurring isotopes: 85 Rb (atomic mass = 84. 9118 AMU)and 87 Rb (atomic mass = 86. 9092 AMU). The percent abundance of 87Rb can be estimated to be which of the following? (a) 0% (b) 25% (c) 50% (d) 75%arrow_forwardWrite the empirical formula corresponding to each of the following molecular formulas: (a) Al2Br6(b) C8H10(c) C4H8O2(d) P4O10arrow_forward
- Tetracarbon dioxide is an unstable oxide of carbon with thefollowing molecular structure:What are the molecular and empirical formulas of thissubstance? (a) C2O2, CO2 (b) C4O, CO (c) CO2, CO2(d) C4O2, C2O (e) C2O, CO2arrow_forwardDetermine the empirical formula of each of the following compounds. (Type your answer using the format CH4 for CH4 and list the elements in the same order as they are mentioned in the problem.) (a) 0.063 mol chlorine atoms combined with 0.22 mol oxygen atoms(b) 2.45 g silicon combined with 12.4 g chlorine(c) 42.9 mass % carbon and 57.1 mass % oxygenarrow_forwardWhat is the molecular formula of each compound? (Type your answer using the format C6H12O6 for C6H12O6 and use the same order of the elements as in the empirical formulas.) (a) empirical formula CHCl ( = 96.94 g/mol)(b) empirical formula C7H4O2 ( = 240.20 g/mol)(c) empirical formula CH ( = 78.11 g/mol)(d) empirical formula C3H6O2 ( = 74.08 g/mol)arrow_forward
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