Chemistry 101: SH; Cal.; isotope
These are quiet confusing word problems.
a). A student wishes to determine the specific heat of a metal using a coffee cup calorimeter (calorimeter constant 50.35 cal/degrees Celsius). The student heats 130.56 grams of unknown metal from 25.0 degrees Celsius to 100.4 degrees Celsius. The initial temperature of the calorimeter (coffee cup plus 30 mL water) was 23.5 degrees Celsius. The student then adds the hot metal to the coffee cup and temperature changes until equilibrium occurs. The equilibrium temperature is 30.5 degrees Celsius. Answer the following two questions:
1. The heat lost by the metal is gained by_________
2. What is the secific heat of the unknown metal?
b). A compound containg only carbon and hydrogen is 7.74% H by mass and has a molar mass of 78.1 g/mol. determine the empirical and molecular formulae of the compound.
c). An isotope of a neutral atom has 19 electrons and 22 neutrons? Give the atomic symbol of the element.
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