Which of these nine alkanes are gases at room temperature (20°c)

methane, ethane, propane and butane are the alkanes that are gases at room temperature. all four of these alkanes have four or fewer carbon atoms. alkanes with more carbon content are liquid or solid at room temperature. hexane and octane are examples of alkanes that are liquid at room temperature.

the equation that correctly represent the reaction for formation of ammonia is

n2+ 3h2 → 2nh3 (answer d)

1 mole of nitrogen gas (n2) react with 3 moles of hydrogen gas (h2) to form 2 moles of ammonia ( nh3). this is in a process known as haber process were iron is used as a catalyst and reaction take place that a higher temperature and pressure. the process is exothermic hence energy is released.

passing a magnet thought the

mixture , because iron gets attracted to magnet .