Pergunta

What is the molar mass of CaF_(2) 78.08g/mol 97.08g/mol 59.09g/mol 109.18g/mol What is the molar mass of Al(OH)_(3) 2 110.0g/mol 78.0g/mol 96.0g/mol 130.0g/mol
Solução

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XavierProfissional · Tutor por 6 anos
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To find the molar mass of \( \mathrm{CaF}_{2} \), we need to add the molar masses of calcium (Ca) and fluorine (F). The atomic mass of calcium is approximately 40.08 g/mol, and the atomic mass of fluorine is approximately 19.00 g/mol. Since there are two fluorine atoms in \( \mathrm{CaF}_{2} \), the calculation is:<br /><br />\[ <br />\text{Molar mass of } \mathrm{CaF}_{2} = 40.08 + 2 \times 19.00 = 78.08 \, \text{g/mol} <br />\]<br /><br />So, the correct answer is \( 78.08 \mathrm{~g} / \mathrm{mol} \).<br /><br />For \( \mathrm{Al}(\mathrm{OH})_{3} \), we calculate the molar mass by adding the molar masses of aluminum (Al), oxygen (O), and hydrogen (H). The atomic mass of aluminum is approximately 26.98 g/mol, oxygen is approximately 16.00 g/mol, and hydrogen is approximately 1.01 g/mol. Since there are three hydroxide ions, the calculation is:<br /><br />\[ <br />\text{Molar mass of } \mathrm{Al}(\mathrm{OH})_{3} = 26.98 + 3 \times (16.00 + 1.01) = 26.98 + 3 \times 17.01 = 96.00 \, \text{g/mol} <br />\]<br /><br />So, the correct answer is \( 96.0 \mathrm{~g} / \mathrm{mol} \).
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