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saul85 [17]
3 years ago
10

Species developed harder shelled eggs to raise them on land, this is to adapt to the changes in the enviorment during the Cenozo

ic era. True Or false?
Chemistry
2 answers:
mario62 [17]3 years ago
6 0
False would be the answer
Anna71 [15]3 years ago
5 0

The development of calciferous egg can be traced back to Carboniferous Period. Thus the given statement that

Species developed harder shelled eggs to raise them on land, this is to adapt to the changes in the enviorment during the Cenozoic era is false

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2. Convert 1500 milligrams to grams.​
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in an experiment 3.425g of lead oxide was reduced to form 3.105g of lead the empirical formula of the lead oxide is?​
Romashka-Z-Leto [24]

Answer:

Pb3O4

Explanation:

According to this question, 3.425g of lead oxide was reduced to form 3.105g of lead in an experiment. Since lead oxide contains both lead (Pb) and oxygen (O) element,

Mass of lead oxide = 3.425g

Mass of lead = 3.105g

Mass of oxygen = (3.425g - 3.105g) = 0.320g

Next, we convert each mass value to mole by dividing by respective molar mass

Pb = 3.105g ÷ 207.2 = 0.0149mol

O = 0.320g ÷ 16 = 0.02mol

Next, we divide each mole value by the smallest (0.0149)

Pb = 0.0149mol ÷ 0.0149mol = 1

O = 0.02mol ÷ 0.0149mol = 1.342

Multiply each ratio value by 3 to get:

Pb = 1 × 3 = 3

O = 1.342 × 3 = 4.026

The whole number ratio, approximately, of Pb and O is 3:4, hence, their empirical formula is Pb3O4.

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