Which has a larger atom calcium or barium?

Which of the following describes a situation where competition between producers exists

For the reaction shown, calculate how many moles of no2 form when each of the following completely reacts. 2n2o5(g)→4no2(g)+o2(g) part a 1.0 mol n2o5 express your answer using two significant figures. nothing mol m o l request answer part b 5.4 mol n2o5 express your answer using two significant figures.

Which of these features are formed when hot groundwater is forced out through cracks in the earth's surface?