D Snack Mix because they are individual parts that can easily be seperated
Answer:
C₂₁H₁₅N₉O₁₈
Explanation:
Molecular formula is the ratio of atoms that are present in 1 molecule of the compound. We need to find moles of all atoms to find this ratio.
In a basis of 100, moles of C and O are:
<em>Moles C:</em>
37.0 * (1mol / 12g) = 3.083 moles C
<em>Moles O: </em>
42.5g * (1mol / 16) = 2.656 moles O
Now, to find moles of H, we need determine moles of H2O produced:
0.0310g H2O * (1mol / 18g) = 1.72x10⁻³ moles H2O * 2 = 3.44x10⁻³ moles H
These moles were produced when 0.157g of the compound react. In a basis of 100g:
3.44x10⁻³ moles H * (100g / 0.157g) = 2.194 moles H
In the same way, moles of N are:
0.0230g NH3 * (1mol / 17g) = 1.35x10⁻³ moles H2O
These moles were produced when 0.103g of the compound react. In a basis of 100g:
1.35x10⁻³ moles H * (100g / 0.103g) = 1.313 moles N
Empirical formula is (The simplest whole number ratio of atoms presents in a molecule). Dividing in the low number of moles (Moles N):
C: 3.083 moles C / 1.313 moles N = 2.3
O: 2.656 moles O / 1.313 moles N = 2.0
N: 1.313 moles N / 1.313 moles N = 1
H: 2.194 moles H / 1.313 moles N = 1.67
This ratio times 3 (To have the whole number ratio):
C: 7
O: 6
N: 3
H: 5
The empirical formula is:
C₇H₅N₃O₆
And weighs:
C: 7*(12g/mol)= 84
H: 5 * (1g/mol) = 5
N: 3 * (14g/mol) = 42
O: 6* (16g/mol) = 96
227g/mol
As the molecular mass of the compound is 681g/mol:
681 / 227 = 3
The empirical formula times 3 is the molecular formula, that is:
C₇H₅N₃O₆ × 3
<h3>C₂₁H₁₅N₉O₁₈</h3>
A cold air mass moves into an area of warm air
The sulphate solutions came from a recycling LIBs waste cathode materials, which were done by previous research; their content is shown in Table 1 [18]. Sodium carbonate (Na2CO3) was purchased from Nihon Shiyaku Reagent, Tokyo, Japan (NaCO3, 99.8%), for the chemical precipitation. CO2 was purchased from Air Product and Chemical, Taipei, Taiwan (CO2 ≥ 99%), to carry out the hydrogenation–decomposition method. Dowex G26 was obtained from Sigma-Aldrich (St. Louis, MO, USA) and was used as a strong acidic cation exchange resin, to remove impurities. Multi-elements ICP standard solutions were acquired from AccuStandard, New Haven, Connecticut State, USA. The nitric acid (HNO3) and sulfuric acid (H2SO4) were acquired from Sigma-Aldrich (St. Louis, MO, USA) (HNO3 ≥ 65%) (H2SO4 ≥ 98%) The materials were analyzed by energy-dispersive X-ray spectroscopy (EDS; XFlash6110, Bruker, Billerica, MA, USA), X-ray diffraction (XRD; DX-2700, Dangdong City, Liaoning, China), scanning electron microscopy (SEM; S-3000N, Hitachi, Tokyo, Japan), and inductively coupled plasma optical emission spectrometry (ICP-OES; Varian, Vista-MPX, PerkinElmer, Waltham, MA, USA). In order to
Appl. Sci. 2018, 8, 2252 3 of 10
control the hydrogenation temperature and heating rate, a thermostatic bath (XMtd-204;
