16) How many molecules are there in 230 grams of NH_(4)OH WKS001X012 (2000 Cavalcade Publishing (http://www .cavalcadepublishing.com) A

To find the number of molecules in 230 grams of NH4OH, we need to follow these steps:<br /><br />1. Calculate the molar mass of NH4OH.<br />2. Convert the given mass of NH4OH to moles.<br />3. Use Avogadro's number to find the number of molecules.<br /><br />Step 1: Calculate the molar mass of NH4OH.<br />The molar mass of NH4OH is the sum of the molar masses of its constituent atoms:<br />Molar mass of N = 14.01 g/mol<br />Molar mass of H = 1.01 g/mol<br />Molar mass of O = 16.00 g/mol<br /><br />Molar mass of NH4OH = (1 × 14.01) + (4 × 1.01) + 16.00 = 35.05 g/mol<br /><br />Step 2: Convert the given mass of NH4OH to moles.<br />Given mass of NH4OH = 230 grams<br />Moles of NH4OH = Given mass / Molar mass<br />Moles of NH4OH = 230 g / 35.05 g/mol = 6.56 moles<br /><br />Step 3: Use Avogadro's number to find the number of molecules.<br />Avogadro's number = 6.022 × 10^23 molecules/mol<br />Number of molecules = Moles × Avogadro's number<br />Number of molecules = 6.56 moles × 6.022 × 10^23 molecules/mol = 3.96 × 10^24 molecules<br /><br />Therefore, there are approximately 3.96 × 10^24 molecules in 230 grams of NH4OH.