If you have a balloon filled with one mole of gas at zero degrees Celsius at a pressure of one atmosphere, how many gas particles do you have?

660 billion
A google
602 sextillion
Scientists don't know the answer

1) which of the following is the best example of a physical change? a) sugar dissolving in tea b) firefly glowing 2) in the combustion of ethane, what is/are the reactants? c2h6 + o2 ==> co2 + h2o a) c2h6 and o2 b) co2 and c2h6

An alloy contains 66 g of pure zinc. what is the percentage of zinc in the alloy? express your answer to two significant figures and include the appropriate units.

What conclusion can you draw from this experiment about the components of the black ink?