The number of oxygen atoms = 3
Mass = 24 g
<h3>Further explanation</h3>
The formula of a compound shows the composition of the constituent elements
CaCO₃ is composed of 3 types of elements, namely Ca, C and O
The amounts of each of these elements in the compound CaCO₃:
So the number of oxygen atoms = 3
mass of Oxygen :
![\tt mass~O=\dfrac{3\times Ar~O}{MW~CaCO_3}\times mass~CaCO_3\\\\mass~O=\dfrac{3\times 16}{100}\times 50=24~g](https://tex.z-dn.net/?f=%5Ctt%20mass~O%3D%5Cdfrac%7B3%5Ctimes%20Ar~O%7D%7BMW~CaCO_3%7D%5Ctimes%20mass~CaCO_3%5C%5C%5C%5Cmass~O%3D%5Cdfrac%7B3%5Ctimes%2016%7D%7B100%7D%5Ctimes%2050%3D24~g)
Answer:
Explanation:
Unclear question.
I infer you want a clear rendering, which reads;
A 258.4 g sample of ethanol (C2H5OH) was burned in a calorimetric pump using a Dewar glass. As a consequence, the water temperature rose to 4.20 ° C.
If the heat capacity of the water and the surrounding glass was 10.4 kJ / ° C, calculate the heat of combustion of one mole of ethanol.
Answer:
C. because the 4s orbital is at a lower energy level
Explanation:
Groups are numbered 1–18 from left to right. The elements in group 1 are known as the alkali metals; those in group 2 are the alkaline earth metals; those in 15 are the pnictogens; those in 16 are the chalcogens; those in 17 are the halogens; and those in 18 are the noble gases.
D. uranium: atomic number 92, mass 238, neutrons 146
238-92=146