Two chemistry students are preparing for the “Getting the Volume Right” lab challenge. Their goal is to fill a 1000-mL graduated cylinder with CO2 gas
from a chemical reaction. They will react Na2CO3 with an excess of HCl acid to
generate the gas. If the temperature on the day of the contest is 19.4oC and
the room pressure is 1007 mbar, how many grams of Na2CO3 must they add
to the acid to produce the desired volume of CO2 gas? How many moles of
HCl will they need?

Nanotechnology, the field of trying to build ultrasmall structures one atom at a time, has progressed in recent years. one potential application of nanotechnology is the construction of artificial cells. the simplest cells would probably mimic red blood cells, the body's oxygen transporters. for example, nanocontainers, perhaps constructed of carbon, could be pumped full of oxygen and injected into a person's bloodstream. if the person needed additional oxygen-due to a heart attack perhaps, or for the purpose of space travel-these containers could slowly release oxygen into the blood, allowing tissues that would otherwise die to remain alive. suppose that the nanocontainers were cubic and had an edge length of 24 nanometers. part a part complete what is the volume of one nanocontainer? (ignore the thickness of the nanocontainer's wall.) express your answer using two significant figures. v v = 1.4ă—10â’20 l previous answers correct significant figures feedback: your answer 1.3824â‹…10â’20 = 1.382ă—10â’20 l was either rounded differently or used a different number of significant figures than required for this part. if you need this result for any later calculation in this item, keep all the digits and round as the final step before submitting your answer. part b suppose that each nanocontainer could contain pure oxygen pressurized to a density of 81 g/l . how many grams of oxygen could be contained by each nanocontainer?

Which metal exist in liquid state and can be cut with knife ?

Which characteristics can be used to differentiate star systems? check all that apply.