Use the compound Al(NO3)3 to answer the following questions: 1. What is the molar mass of...
Use the compound Al(NO3)3 to answer the following questions:
1. What is the molar mass of this compound? Show your work.
2. How many moles of this compound are found in 5 grams of the compound? Show your work.
3. How many molecules is this? Show your work.
Homework Answers
1.
Molar mass = 1×27+3×14+9×16 = 213.0 g/mol
2. Moles = mass/molar mass
Mole = 5.0/213.0 => 0.0235 mol
3. Number of molecues = moles ×NA
=> 0.0235×6.022×1023
= 1.41×1022 molecues
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