đốt cháy hoàn toàn m(gam) photpho trong không khí thu được hợp chất điphotpho pentao oxit*(P2O5).Tính khối lượng của Photpho cần dùng dể phản ứng đủ với 3,36lít khí O2(dktc)

2pos suppose an object in free fall is dropped from a building. its starting velocity is 0 m/s. ignoring the effects of air resistance, what is the speed (in m/s) of the object after falling 3 seconds? give your answer as a positive decimal without units. answer here

What element has similar physical and chemical properties as boron.

What volume of 0.500 mol/l hydrochloric acid, hci (aq) is required to react completely with 1.00 g of aluminum hydroxide, ai(oh)3 (s)?