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- Write a chemical formula for a compound that containstwo chlorine atoms to every one oxygen atom. (a) Cl2O(b) ClO2(c) 2ClO(d) Cl(O2)2(a) Atoms are very small compared to objects on the macroscopic scale. The radius of a vanadium atom is 131 pm. What is this value in meters and in centimeters? cm (b) The mass of a single vanadium atom is 8.46×10-23 g. Suppose enough V atoms were lined up like beads on a string to span a distance of 44.7 cm ( 18 atoms inches). How many atoms would be required? What mass in grams of V would be used? Could you weigh out this amount of vanadium using a typical laboratory balance? (c) Taking the density of vanadium metal to be 6.08 g/cm³, calculate the mass of metal needed to form a piece of V wire with the same length as the distance in b, but with a diameter of 1.00 mm. Hint: The volume of a cylinder is T times its radius squared times its height. (V = T r² h) How many vanadium atoms does this represent? atomsCapsaicin, the compound that gives the hot taste to chili peppers, has the formula C18H27NO3.(a) Calculate its molar mass.(b) If you eat 55 mg of capsaicin, what amount (moles) have you consumed?(c) Calculate the mass percent of each element in the compound.(d) What mass of carbon (in milligrams) is there in 55 mg of capsaicin?
- (a) In the certain hydrated salt MSO3⋅4H2O, the mass percentage of H2O is 44.71%. Identify the element M in the salt? (b) A certain element has two naturally occurring isotopes. The mass of one of the isotopes is 120.904 amu and its natural abundance is 57.21%. The mass of the second isotope is 122.904 amu. Calculate the average atomic mass Write the chemical symbols of the isotopesWhich compound of calcium is used for swimming pool water and sewage treatment? (A) Calcium hydroxide, Ca(OH)2 (B) Calcium hypochlorite, Ca(OCl)2 (C) Calcium carbonate, CaCO3 (D) Calcium oxide, CaO(a) Atoms are very small compared to objects on the macroscopic scale. The radius of a nickel atom is 125 pm. What is this value in meters and in centimeters? cm -23 (b) The mass of a single nickel atom is 9.75×10 g. Suppose enough Ni atoms were lined up like beads on a string to span a distance of 31.3 cm (12 inches). How many atoms would be required? atoms What mass in grams of Ni would be used? Could you weigh out this amount of nickel using a typical laboratory balance? (c) Taking the density of nickel metal to be 8.91 g/cm, calculate the mass of metal needed to form a piece of Ni wire with the same length as the distance in b, but with a diameter of 1.00 mm. Hint: The volume of a cylinder is n times its radius squared times its height. (V = nr h) How many nickel atoms does this represent? atoms
- Capsaicin, the compound that gives the lhot taste to chili peppers, has the formula C18H27NO3.(a) Calculate its molar mass.(b) If you eat 55 mg of capsaicin, what amount (moles) have you consumed?(c) Calculate the mass percent of each element in the compound.(d) What mass of carbon (in milligrams) is there in 55 mg of capsaicin?(a) How many elements are found in period 4 in the periodic table? (b) How many elements are found in group 4A (or 14)?Name the following ionic compounds: (a) Li2O(b) FeCl3(c) NaClO(d) CaSO3(e) Cu(OH)2(f) Fe(NO3)2
- (a) In the certain hydrated salt MSO34H2O, the mass percentage of H2O is 44.71%.Identify the element M in the salt?(b) A certain element has two naturally occurring isotopes.The mass of one of the isotopes is 106.905 amu and its natural abundance is 51.60%.The mass of the second isotope is 108.883 amu.Calculate the average atomic massWrite the chemical symbols of the isotopes(c) An organic compound consists of carbon, hydrogen and sulfur only.The percentage of carbon by mass in this compound was found to be 30.27%.The complete combustion of 1.367 g this compound produces 1.765 g of sulfur dioxide(SO2) (i) Determine the empirical formula for this compound.(ii) If a sample of this compound having the mass 3.781 × 103 mg contains 9.528 × 10–3 molesof the compound, determine the molecular formulaD1. One atom has 20 protons and a mass number of 44. Another atom has 20 protons and a mass number of 40. (a) What is the similarity and dissimilarity in these atoms? (b) The atom combines with phosphate ion. Write the chemical formula and chemical name of the compound. (c) What is the valency and oxidation number of an atom in the elemental form?What are the basic units-single atoms, molecules, or for- mula units-that compose each substance? (a) BaBr2 (b) Ne (c) I2 (d) CO