Which of the following is the best instrument to use to prepare a solution?

What is the temperature of one mole of helium gas at stp?

Can someone me with 6 to 10 plz this is for masteries test.

2-bromo-2-methylbutane undergoes an e1 elimination reaction in the presence of ethanol. in the next reaction only one of the possible products is represented. although the product shown is not the major product of the reaction, notice that there is more than one way it can be produced. complete the mechanism and draw the missing substances.