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Practice Problem ATTEMPT
In each case, calculate the appropriate ratio to show that the information given is consistent with the law of multiple proportions. (a) Both ammonia
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Chemistry
- How many of each type of atom are there in the formula (NH4)2HPO4? A) N = 2, H = 9, P = 1, O = 4 B) N = 1, H = 5, P = 1, O = 4 C) N = 2, H = 5, P = 1, O = 4 D) N = 2, H = 8, P = 1, O = 4 E) none of the above Group of answer choices A B C D Earrow_forward13. Consider the table below. What is the relative abundance of isotope A? Isotope Abundance A 65 В 115 C 20 (A) 0.100 (B) 0.325 (С) 0.575 (D) 0.650 14. How many grams of copper are in 4.6 moles of copper? (A) 0.072 grams (B) 13.8 grams (C) 134.2 grams (D) 292 grams 15. As a distant star moves away from Earth, the light given off by the star has a measurably lower frequency. What happens to the wavelength and energy of the photons of light when the frequency becomes lower? (A) The wavelength becomes longer, and the energy decreases. (B) The wavelength becomes shorter, and the energy decreases. (C) The wavelength becomes longer, and energy increases. (D) The wavelength becomes shorter, and the energy increases.arrow_forwardPractice Name the following compounds. CI HO H OH Br- 20arrow_forward
- Phosphorus has the molecular formula P4, and sulfur has the molecular formula S8. How many grams of phosphorus contain the same number of molecules as 4.23 g of sulfur? (A) 0.490 g (B) 2.04 g (C) 4.08 g (D) 4.23 garrow_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_forwardWhat is the correct formula for phosphorus pentachloride? (a) PCl5 (b) P5Cl (c) P(ClO)5 (d) PO4Cl (e) PClOarrow_forward
- lot Submitted 130 120 110 100 90 80 70 60 50 . Stable • Radioactive 40 30 20 10 10 20 30 40 50 60 70 80 90 100 Number of protons (Z) For heavier nuclei (Z > 40), which of the following describes the relative number of protons and neutrons in the nuclei that exist? they are about equal there are more protons than neutrons there are more neutrons than protons Check Next (2 of 11) Number of neutrons (N)arrow_forwardO Macmillan Learning On another planet, the isotopes of titanium have the given natural abundances. Abundance Mass (u) 74.200% 45.95263 15.100% 47.94795 10.700% 49.94479 Isotope 46 Ti 48 Ti 50 Ti What is the average atomic mass of titanium on that planet? average atomic mass= uarrow_forwardModule Knowledge Check Complete the table below by writing the symbols for the cation and anion that ionic compound cation Na Cl Co F2 Ni Br₂ (NH₂)₂0 C(CO₂), I Don't Know Na Submit anion Cl 0 0 Uarrow_forward
- How many moles of atoms are in each elemental sample? (a) 4.6 × 102ª Pb atoms (b) 2.87 × 1022 He atoms (d) 4.41 × 1021 Ca atoms (c) 7.91 × 10²3 K atomsarrow_forwardQuestion completion Status: What is the symbol of the element in Group 4A(14) and Period 2? C Be Ca Si Mg 00000 QUESTION 26 41 Given the following: 19 X, 39 41 19 X, 20 X, and 41 39 X and X are isotopes of each other. 19 19 O 41 41 X and. X are isotopes of each other, and 19 20 O 41 39 41 X, 39 19 19 20 X, and 18 O None are isotopes of each other. QUESTION 27 39 18 X. Which are isotopes of each other? Valence electrons are electrons located O throughout the atom. in the nucleus of an atom. in the outermost energy level of an atom. in the innermost energy level of an atom. in the first three shells of an atom. 39 X are isotopes of each other. 19 X and 39 18 X are isotopes of each other.arrow_forwardWhich of the following is the molecular weight of a binary compound made from the element calcium and a halogen element? O (A) 59.1 g/mol O (B) 75.6 g/mol O (C) 110 g/mol O (D) 120 g/molarrow_forward
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