- Einstein S Famous Equation E Mc Expresses The Relationship Between Energy E In Joules And Mass M In Kilograms Whe 1 (29.21 KiB) Viewed 56 times
- Einstein S Famous Equation E Mc Expresses The Relationship Between Energy E In Joules And Mass M In Kilograms Whe 2 (58.18 KiB) Viewed 56 times
- Einstein S Famous Equation E Mc Expresses The Relationship Between Energy E In Joules And Mass M In Kilograms Whe 3 (44.99 KiB) Viewed 56 times
Part A You have a badly tarnished silver teapot. The tarnish is a result of the silver metal reacting with the oxygen in the air according to 4Ag(s) + O₂(g)→2Ag₂O(s), AH = −62.2 kJ/mol You carefully clean the teapot and then, out of curiosity, you weigh it. The teapot has a mass of 833 g . After some more measuring and calculating, you also determine that 4.90 % of the silver is on the surface and exposed to the air. If the teapot were once again to become completely tarnished, how much mass Am is converted to energy? Express your answer to three significant figures and include the appropriate units. ► View Available Hint(s) μA ? Δm = 1.31• 10- - 13 Submit Previous Answers X Incorrect; Try Again; 3 attempts remaining 6.D
Part B Cobalt-60 is a radioactive isotope that is commonly used for cancer radiation therapy. The cobalt-60 atom decays to the stable nickel-60 atom, releasing a beta particle (electron) and energy in the form of gamma rays: 60 Co-60Ni+B+Y If you captured the energy from the decay of a 0.210 g pellet of isotopically pure cobalt-60, how long could you run a 50.0 W light bulb? The relevant masses are as follows: Substance Mass (g/mol) 60 Co 59.933819 60 Ni 59.930788 B 0.000549 Gamma rays are massless. Express your answer to three significant figures and include the appropriate units. ► View Available Hint(s) www. μÀ ? hours of light = 4.35 • 106 h Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining