The horizontal rows on the periodic table are called periods. Those do not share the same properties.
Answer:
397.76 g
Explanation:
From the question given above, the following data were obtained:
Number of mole of A₃B₄C₈D₉ = 0.44 mol.
Mass of A₃B₄C₈D₉ =.?
Next, we shall determine the molar mass of A₃B₄C₈D₉. This is illustrated below:
Molar mass of A₃B₄C₈D₉ = (3×7) + (4×26) + (8×40) + (9×51)
= 21 + 104 + 320 + 459
= 904 g/mol
Finally, we shall determine the mass of A₃B₄C₈D₉. This can be obtained as follow:
Number of mole of A₃B₄C₈D₉ = 0.44 mol.
Molar mass of A₃B₄C₈D₉ = 904 g/mol
Mass of A₃B₄C₈D₉ =?
Mole = mass /Molar mass
0.44 = mass /904
Cross multiply
Mass = 0.44 × 904
Mass of A₃B₄C₈D₉ = 397.76 g
Therefore, the mass of A₃B₄C₈D₉ is 397.76 g
D. a bond between two atoms
A covelant bond is a bond formed by a sharing of a pair of electrons by two atoms.
The protons of methylene group between the two carbonyl groups in ethylacetoacetate are acidic in nature. When compounds containing such acidic protons are treated with bases the loose proton and form enolates.
In this particular example when ethylacetoacetate is reacted with methyl magnesium bromide, the methyl group abstracts the acidic proton and converts into
methane gas. The enolate when hydrolyzed is again converted into ethylacetoacetate as shown below,