Answer:
2 Answers. The column is filled with the carrier (liquid or gas) before the sample is injected. Thus if there is no interaction between the sample and the column, then the fastest that the sample can get to the detector is the dead time denoted by tM in the diagram.
M(Li2O) = 2M(Li) +M(O)= 2*6.9 +16.0 = 29.8 g/moi
Answer A. 29.9 g/mol
Answer:
For any given isotope, the sum of the numbers of protons and neutrons in the nucleus is called the mass number. This is because each proton and each neutron weigh one atomic mass unit. By adding together the number of protons and neutrons and multiplying by 1 amu, you can calculate the mass of the atom.
Explanation:
Answer: C₅H₁₂(g) +8O₂(g) → 5CO₂(g) + 6H₂O(g)
Explanation:
I recommend to follow the whole process from the reactants to the products.
1) Word equation:
pentane + oxygen → carbon dioxide + water
This is a combustion (oxidation) reaction of an hydrocarbon.
2) Chemical equation:
C₅H₁₂(g) +O₂(g) → CO₂(g) + H₂O(g
3) As per the mass conservation law, in a chemical reaction, the number of each kind of atoms in the reactants must be equal to the number of the same kind of atoms in the products, which implies that you must add the coefficients required to balance the two sides of the reaction.
- Start balancing the C atoms by adding a coefficient (5) in front of CO₂:
C₅H₁₂(g) +O₂(g) → 5CO₂(g) + H₂O(g)
- Continue adding a coefficient (6) in front of H₂O to balance the H atoms:
C₅H₁₂(g) + O₂(g) → 5CO₂(g) + 6H₂O(g)
- So far, there are 5 atoms of C on each side, and 12 atoms of H on each side.
- So, count the O atoms: there are 2 on the left side and 5×2 + 6 = 16 atomos of O on the right side. Then, you must add a coefficient (8) in front of O₂ on the left side to balance this atom, leading to this final result:
C₅H₁₂(g) +8O₂(g) → 5CO₂(g) + 6H₂O(g)
Finally, there are 5 atoms of C, 16 atoms of O, and 12 atoms of H on each side, and the equation is balanced.