An element has two common isotopes 9889 of its atoms have
An element has two common isotopes. 98.89% of its atoms have an atomic mass of 12.09 amu, whereas the other 1.11% have an atomic mass of 13.10 amu. Using the isotopic composition provided, calculate the average atomic mass of the element.
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The current in a coil drops from 3.9 A to 2.7 A in 0.52 s. If the average emf induced in the coil is 12 mV, what is the self-inductance of the coil
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If 1.87 {rm g} of acetic acid(rm CH_3CO_2H) reacts with 2.31 {rm g} of isopentyl alcohol(rm C_5H_{12}O) to give 2.96 {rm g} of isopentyl acetate(rm C_7H_{14}O_2), what is the percent yield of the reaction?
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A tiny speck (8.3 x 10-7 mol) of americium-241 is used in smoke detectors, how many atoms of americium-241 are there in one of these smoke detectors?
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