Hòa tan 1 lượng hh gồm al và al2o3 trong dd h2so4 loãng vừa đủ thu đc dd X trong đó số nguyên tử oxi gấp 19,5 lần số nguyên tử nhôm. a:tính nồng độ phần trăm của chất tan có trong dd X, b :cho 82,8 gam dd X tác dụng với V lít dd NaOh 1M, sau phản ứng thu đc 14,04 gam kết tủa. Tìm V​

If 10.g of agno3 is available, what volume of 0.25 m agno3 can be prepared

In the following table, all the columns for the element calcium are filled out correctly. element electron structure of atom electron structure of ion net ionic charge calcium 1s22s22p63s23p64s2 1s32s22p63s23p64s1 +1 true false

The two naturally occurring isotopes of chlorine are 35cl (34.969 amu, 75.77%) and 37cl (36.966 amu, 24.23%). the two naturally occurring isotopes of bromine are 79br (78.918 rm amu, 50.69%) and 81br (80.916 amu, 49.31%). chlorine and bromine combine to form bromine monochloride, brcl. 1. how many peaks will be present in a mass spectrum for brcl? the four combinations of molecule possible given these four isotopes are: 81br37cl, 81br35cl, 79br37cl, and 79br35cl. 2. what are the masses of the four different brcl molecules? express the masses using six significant figures, in decreasing numeric order (highest to lowest), separated by commas.