The answer is 0.5010
Number of moles (n) is equal to the quotient of mass (m) and molar mass of a sample (Mr):
n = m/Mr
We have:
n = ?
m = 40.10 g
Mr = 80.0432 g/mol
n = 40.10 g : 80.0432 g/mol = 0.5010
<span>40.10 has 4 significant digits,
</span><span>80.0432 has 6 significant digits.
Since 4 is less than 6, we choose 4 </span>significant digits
Answer:
The evidence that is most likely to support the idea that dinosaurs and their ancestors could have coexisted for millions of years is bones of three different species were found in the same rock layer (option D).
Explanation:
Fossils have been the strongest evidence of the existence of extinct species in the remote past. The discovery of some species and their possible ancestors in the same layer of rocks confirms the possibility of the coexistence of evolutionary forms of the same species, for a great period of time.
Once the fossils have been found, paleontologists use molecular genetic techniques to identify the fossils and their relationship with others found in the same place.
The approach suggests that it is not necessary for a species to become extinct in order for its evolutionary descendant to appear, considering coexistence for thousands or even millions of years.
The other options do not provide solid evidence to support this approach.
<em>A. Fewer fossils were found of amphibians than of dinosaurs, which does not specify an evolutionary relationship.</em>
<em>B. More fossils found were of larger organisms than of dinosaurs, which is not true, because species descended from dinosaurs tend to be smaller.</em>
<em>C. Herbivore bones were found in each rock layer, not related to the approach.</em>
A Scottish scientist Graham, Thomas formulated Graham's law of effusion or simply Graham's law. This law states that rate of gas 1 over gas 2 is equal to the square root of the molar mass of gas 2 over <span>he square root of the molar mass of gas 1. Since the molar mass of Neon is 4, the answer is then 8.16 g/mol</span>
There had been new discoveries of chemicals that have been added to the periodic table in recent years