A sample of nitrogen gas (N2) contains 3. 0 x 1024 atoms of nitrogen. About how many moles of nitrogen gas are in the sample?
1). 1.0
2). 2.5
3). 3.0
4). 5.0


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

Which of these is a physical property

What state of matter is ice a. liquid b. element c. solid d. gas