kiennguyen

What is made of gas atoms that have been cooled to near absolute zero at which temperature the atoms slow down, combine and forms a single entity known called a superatom?

What are the main energy levels where the valence electrons belong called?

What mass of H2SO4 is contained in 25g of 15% w/w solution? (Relative atomic mass are H=1amu , S=32amu, O=16amu)

4.The gas usually filled in the electric bulb is?

A. nitrogen B. hydrogen C. carbon dioxide D. oxygen

Calculate the molality of 20% w/w aqueous solution of H2SO4 (Relative atomic mass are: H=1amu, S=32amu, O=16 amu )

What mass of Ca(OH)2 is required to prepare 200mL of 0.2N solution? (Relative atomic mass are Ca=40smu , H=1amu , O=16amu)

Calculate the mean for the following 4 numbers for the concentration of chloride in a sample: 0.1015, 0.0991, 0.1016, and 0.1017.     

What is the mass, in grams, of 9.58×1024 molecules9.58×1024 molecules of methanol (CH3OH)?

How many mol H2SO4 can be produced?

tính khối lượng của 0.5 mol h2so4

you need to prepare 750.ml a diluted hydrochloric acid solution that has a molarity of .550m. the stock solution is 12.0m. how much of the stock solution must you take to make the diluted solution

you need to prepare a diluted sulfuric acid solution that is .500M. the original stock solution is 18.0M and you pull out 2.50ml how much water must you add to make the diluted solution

1. Mass spectrum analysis of c8h7n

h2s04(đặc nóng )+Fe--->   ..............