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A rough estimate of the radius of a nucleus is provided by the formula
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Principles of Modern Chemistry
- The age of the universe is unknown, but some conclude from measuring Hubbles constant that the age is about 18 billion years old, which is about four times the age of Earth. If so, calculate the age of the universe in seconds. If you had a sample of carbon with the same number of carbon atoms as there have been seconds since the universe began, determine whether you could measure this sample on a laboratory balance that can detect masses as small as 0.1 mg.arrow_forwardCalculate the mass of hydrogen in 1.00 kg of ammonia borane. The density of ammonia borane is 0.780 g/cm3.arrow_forwardIn 1774, C. Scheele obtained a gas by reacting pyrolusite (MnO2) with sulfuric acid. The gas, which had been obtained that same year by Joseph Priestley by a different method, was an element, A. (a) What is the element isolated by Scheele and Priestley? (b) Element A combines with almost all other elements. For example, with cesium it gives a compound in which the mass percent of A is 19.39%. The element combines with hydrogen to give a compound with a mass percent of element A of 94.12%. Determine the formulas of the cesium and hydrogen compounds. (c) The compounds of cesium and hydrogen with element A react with one another. Write a balanced equation for the reaction.arrow_forward
- Balance the following equations by filling in the blanks. (a) 92235U+01n54137_+201n+_ (b) 90232Th+612__01n+96240Cm (c) 24He+4296Mo43100_+_ (d) _+12H84210_+01narrow_forwardChlorine exists mainly as two isotopes, 37Cl and 33Cl. Which is more abundant? How do you know?arrow_forwardWhat would be the mass, in kilograms, of a block of graphite consisting of 1.55 x 1026 carbon atoms?arrow_forward
- Some salts have water of hydration and are called hydrated salts. A 3.216 g sample of a hydrated salt of Na,B,O, · XH20 is heated to drive off the water of hydration. The resulting anhydrous salt, which has a mass of 2.222 g, contains 0.5077 g of sodium, 0.4775 g of boron, and some oxygen. What are the values of x, y, z and X in the above salt? Write the numerical values for x, y and z next to the symbol of the element, and X, before H20. Na H2O Barrow_forward18. What is the mass, in micro grams, of 8.9 x 10^15 atoms of cobalt?arrow_forward7. Balance the following equations: a) For the synthesis of urea, a common fertilizer CO2(g) + NH3(g) → NH₂CONH2(s) + H2₂0 (1)arrow_forward
- Can i get some help with this problem?arrow_forwardLook up the following information for the element iridium: (i) number of protons, neutrons, and electrons; (ii) atomic number and average atomic mass; (iii) the charge of the anion(s) or cation(s) that it commonly forms; (iv) the mass of its two most common isotopes and the number of protons and neutrons in each one. Also, comment briefly on the presence of this element in meteorite craters and the significance of this observation.arrow_forwardThe number of protons, neutrons, and electrons, respectively, in the ionic species 209 9Bi* :3+ 83 are: (A) 83, 126, 80; (B) 83, 209, 80; (C) 86, 209, 83; (D) 83, 126, 86;arrow_forward
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