The formula weight of calcium nitrate (ca(no3)2), rounded to one decimal place, is ________ amu. the formula weight of calcium nitrate (ca(no3)2), rounded to one decimal place, is ________ amu. 204.2 150.1 116.1 164.0 102.1
164.0
First we must look up the atomic weight of all elements in calcium nitrate
Ca: 40.078
N: 14.0067
O: 15.999
Then we compute the mass of the nitrate polyatomic ion which contains one nitrogen and 3 oxygen atoms.
14.0067+3*15.999 = 62.0037
For the entire molecule we calculate the weight of two nitrates and one calcium
2 * 62.0037 + 40.078 = 164.0152
rounding to the tenths place results in
164.0
