How do I find how many moles of HF it takes to react completely with 4.90 mol of SiO2? Thanks! 4 HF(g)+SiO2(s) ---> SiF4(g)+2H2O(l)

In what environment would mineral formation caused by high pressures and high temperatures most likely occur?

What is the mass of 2.00 l of an intravenous glucose solution with a density of 1.15 g/ml?

6. using 3 – 4 sentences explain (in your own words) why water expands when it freezes? 7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation.