Input interpretation
![trisilane | molar mass](../image_source/daaf7057ea3ce357279edbf6f81a6814.png)
trisilane | molar mass
Result
![Find the molar mass, M, for trisilane: M = sum _iN_im_i Plan: • Write the chemical formula and gather atomic masses from the periodic table. • Determine values for N_i and m_i using these items. • Finally, compute the mass. Write the chemical formula: H_8Si_3 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i H (hydrogen) | 8 Si (silicon) | 3 Look up the atomic mass, m_i, in g·mol^(-1) for each element in the periodic table: | N_i | m_i/g·mol^(-1) H (hydrogen) | 8 | 1.008 Si (silicon) | 3 | 28.085 Multiply N_i by m_i to compute the mass for each element. Then sum those values to compute the molar mass, M: Answer: | | | N_i | m_i/g·mol^(-1) | mass/g·mol^(-1) H (hydrogen) | 8 | 1.008 | 8 × 1.008 = 8.064 Si (silicon) | 3 | 28.085 | 3 × 28.085 = 84.255 M = 8.064 g/mol + 84.255 g/mol = 92.319 g/mol](../image_source/7394fa5bbe152b26f659be09f2dafd1c.png)
Find the molar mass, M, for trisilane: M = sum _iN_im_i Plan: • Write the chemical formula and gather atomic masses from the periodic table. • Determine values for N_i and m_i using these items. • Finally, compute the mass. Write the chemical formula: H_8Si_3 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i H (hydrogen) | 8 Si (silicon) | 3 Look up the atomic mass, m_i, in g·mol^(-1) for each element in the periodic table: | N_i | m_i/g·mol^(-1) H (hydrogen) | 8 | 1.008 Si (silicon) | 3 | 28.085 Multiply N_i by m_i to compute the mass for each element. Then sum those values to compute the molar mass, M: Answer: | | | N_i | m_i/g·mol^(-1) | mass/g·mol^(-1) H (hydrogen) | 8 | 1.008 | 8 × 1.008 = 8.064 Si (silicon) | 3 | 28.085 | 3 × 28.085 = 84.255 M = 8.064 g/mol + 84.255 g/mol = 92.319 g/mol
Unit conversion
![0.09232 kg/mol (kilograms per mole)](../image_source/879406df2af3cfba472d793a6313ddae.png)
0.09232 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.13 ≈ 1/8 ) × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/5ccabe1fc6f569b589b9e6c4261b1dd9.png)
≈ ( 0.13 ≈ 1/8 ) × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 0.48 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/ced92f5b12d9f247ec343e30fe007e0f.png)
≈ 0.48 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 1.6 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/f3d2a2bb9ce734e24a82d89e3e0dc203.png)
≈ 1.6 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 1.5×10^-22 grams | 1.5×10^-25 kg (kilograms) | 92 u (unified atomic mass units) | 92 Da (daltons)](../image_source/82e732915770b1dbbf4e3e19fa81ab69.png)
Mass of a molecule m from m = M/N_A: | 1.5×10^-22 grams | 1.5×10^-25 kg (kilograms) | 92 u (unified atomic mass units) | 92 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 92](../image_source/c3056bafad7378af2f848185dbe7bb36.png)
Relative molecular mass M_r from M_r = M_u/M: | 92