One of the biggest problem is radiation. Once you get out if the earth's magnetic field you have your astronauts exposed to solar radiation. Even sending a team to mars is not possible because the radiation would almost certainly kill them. Until some way is figured out to shield the astronauts from the sun's radiation and other cosmic radiation we are pretty much stuck.
<span>another limitation is the span of the human life. assuming that you want to go outside of the solar system, it is much too far to travel for a human. in addition there is the speed limitation. of course, Einstein predicts that in order to travel at the speed of light, the substance must have no mass. therefore, it is impossible for a human - let alone a spaceship - to travel at that speed, crushing our dreams of interstellar travel (in a human lifespan).
Since we are only asked for the number of moles, we don't need the information of density. The concentration is expressed in terms of 0.135 M AgCl or 0.135 moles of AgCl per liter solution. The solution is as follows:
