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Chapter 3: Problem 1
Calculate the mass ratio of a bromine atom to an atom of (a) neon (b) calcium (c) helium
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How many protons are in (a) an atom of platinum? (b) one mole of platinum? (c) one gram of platinum?
The meat from one hazelnut has a mass of \(0.985 \mathrm{~g}\). (a) What is the mass of a millionth of a mole \(\left(10^{-6}\right)\) of hazelnut meats? (A millionth of a mole is also called a micromole.) (b) How many moles are in a pound of hazelnut meats?
Write a balanced equation for (a) the reaction between fluorine gas and water to give oxygen difluoride and hydrogen fluoride gases. (b) the reaction between oxygen and ammonia gases to give nitrogen dioxide gas and water. (c) the burning of gold(III) sulfide in hydrogen to give gold metal and dihydrogen sulfide gas. (d) the decomposition of sodium hydrogen carbonate to sodium carbonate, water, and carbon dioxide gas. (e) the reaction between sulfur dioxide gas and liquid hydrogen fluoride to give sulfur tetrafluoride gas and water.
Nitrogen reacts with hydrogen to form ammonia. Represent each nitrogen atom by a square and each hydrogen atom with a circle. Starting with five molecules of both hydrogen and nitrogen, show pictorially what you have after the reaction is complete.
A compound \(\mathrm{XCl}_{3}\) is \(70.3 \%\) (by mass) chlorine. What is the molar mass of the compound? What is the symbol and name of X?
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