Determine the sign of the free energy for the following reaction. How would its spontaneity be described? \( \mathrm{CH}_{4}(\mathrm{~g})+2 \mathrm{O} 2(\mathrm{~g}) \rightarrow \mathrm{CO}_{2}(\mathrm{~g})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \quad \Delta \mathrm{H}=-890.3 \mathrm{~kJ} / \mathrm{mol} ; \quad \Delta \mathrm{S}=+186.3 \mathrm{~J} / \mathrm{mol}-\mathrm{K} \) A Spontaneous at all temperatures B Spontaneous at low temperatures only (C) Spontaneous at high temperatures only (D) Not spontaneous at any temperature

32 Antara gas berikut, yang manakah mengandungi 1.2 mol atom pada keadaan bilik? [ 1 mol gas menempati \( 24 \mathrm{dm}^{3} \) pada keadan bilik] Which of the following gases contains 1.2 mol of atoms at room conditions? [1 mol of gas occupies \( 24 \mathrm{dm}^{3} \) at room conditions] A \( 14.4 \mathrm{dm}^{3} \) gas karbon dioksida B \( 14.4 \mathrm{dm}^{3} \) carbon dioxide gas B \( 14.4 \mathrm{dm}^{3} \) gas nitrogen C \( 14.4 \mathrm{dm}^{3} \) nitrogengas \( 14.4 \mathrm{dm}^{3} \) gas metana \( 14.4 \mathrm{dm}^{3} \) methane gas D \( 14.4 \mathrm{dm}^{3} \) gas argon \( 14.4 \mathrm{dm}^{3} \) argongas

The half-life of Radium- 226 is 1590 years. If a sample contains 500 mg , how many mg will remain after 3000 years? Give your answer accurate to at least 2 decimal places.

The half-life of Palladium-100 is 4 days. After 16 days a sample of Palladium- 100 has been reduced to a mass of 6 mg . What was the initial mass (in mg ) of the sample? What is the mass (in mg ) 6 weeks after the start? You may enter the exact value or round to 4 decimal places.

Chemical agents cause all of the * 10 points following except pustules nicotine stomatitis aspirin burn

3. Un mol de un gas ideal se expande reversiblemente a partir de una presión inicial de 10.0 atm hasta una presión final de 0.4 atm, manteniéndose la tempera-tura constante en 273 K, determine:a) El cambio en la energía interna del gas.b) El trabajo hecho por el gas al expandirse.c) El calor transferido durante el proceso *