Answer:
CaO
Explanation:
Firstly, let’s get the percentage compositions.
The total mass is now = 4.008 + 1.600 = 5.608g
The percentage composition of carbon is thus 4.008/5.608 * 100 = 71.47%
The percentage composition of oxygen is 100 - 71.4 = 28.53%
Now, we divide each percentage by the atomic masses. The atomic mass of calcium is 40 while that of oxygen is 16
Ca = 71.47/40 = 1.78675
O = 28.53/16 = 1.783125
Both values are quite similar and dividing by the smallest will yield same values of 1.
Hence , the empirical formula is caO
