Select the single best answer. Which of the following describes the bonding in the hydrogen cyanide molecule, HCN? As N is \( s p \)-hybridized. C uses \( s p \) hybridized orbitals in bonding. C uses \( s p^{2} \) hybridized orbitals in bonding. C uses \( s p^{3} \) hybridized orbitals in bonding. C uses \( s p^{3} d \) hybridized orbitals in bonding.

Nếu một mẫu chất phóng xạ bắt đầu với 100g và giảm đi 12.5% mỗi giờ, tính khối lượng còn lại sau 4 giờ.

c. 5-etil-5metil-1,3-ciclohexadieno

The density of \( \mathrm{SO}_{2} \) and \( \mathrm{CO}_{2} \) are \( 2.9 \mathrm{~g} / \mathrm{dm}^{3} \) and \( 1.98 \mathrm{~g} / \mathrm{dm}^{3} \) respectively. How much faster does \( \mathrm{CO}_{2} \) diffuse through a porous pot?

Select the single best answer. Which of the following describes the bonding in the hydrogen cyanide molecule, HCN? As N is \( s p \)-hybridized. C uses \( s p \) hybridized orbitals in bonding. C uses \( s p^{2} \) hybridized orbitals in bonding. C uses \( s p^{3} \) hybridized orbitals in bonding. C uses \( s p^{3} d \) hybridized orbitals in bonding.

Un laboratorio requiere de \( 2000 \mathrm{~cm}^{3} \) de una solución anticongelante que consiste en \( 30 \% \) mol de metanol en agua ¿Qué volúmenes de metanol puro y de agua pura a \( 25^{\circ} \mathrm{C} \) se deben mezclar para formar los \( 2000 \mathrm{~cm}^{3} \) de anticongelante tambièn a \( 25^{\circ} \mathrm{C} \) ? Asuma qué es una solución ideal. Los volúmenes molares parciales para el metanol y el agua en una solución de \( 30 \% \) mol de metanol y sus volumenes molares de especie pura ambos a \( 25^{\circ} \mathrm{C} \) son los siguientes: Metanol (1) \( \quad \overline{V_{1}}=38.632 \mathrm{~cm}^{3} / \mathrm{mol} \quad V_{1}=40.727 \mathrm{~cm}^{3} / \mathrm{mol} \) Calcule además el error que se produce al asumir que la solucion es ideal.