Fossilized remains of similar plant species were found in all four layers of the rock in the diagram above. Which of the followi
ng species would be MOST closely related?
A. species found in layer A and species found in layer D
B. species found in layer B and species found in layer D
C. species found in layer C and species found in layer D
D. species found in layer A and species found in layer C
A. species found in layer A and species found in layer D
B. species found in layer B and species found in layer D
C. species found in layer C and species found in layer D
D. species found in layer A and species found in layer C
2 answers:
You might be interested in
Answer:
B) 12.9 grams.
Explanation:
How many moles of molecules in that 6.30 L of H₂?
The volume of one mole of an ideal gas at STP (0 °C, 1 atm) is 22.4 liters.
(The volume of that one mole of gas at STP will be 22.7 liters if STP is defined as 0 °C and 10⁵ Pa).
.
How many moles of Na will be needed?
The coefficient in front of Na in the equation is twice the coefficient in front of H₂. It takes two moles of Na to produce one mole of H₂.
.
What's the mass of that many Na atoms?
Refer to a modern periodic table. The molar mass of ₁₁Na is 22.990. The mass of one mole of Na atoms is 22.990 gram. The mass of 0.5625 moles of Na atoms will be
.
(2 sig. fig. as in the volume of the H₂ gas.)
Answer:
The density of the substance is 1.0611
Explanation:
The density of a substance is a characteristic property that matter, whether solids, liquids or gases, has to be compressed in a given space, that is, it allows us to measure the amount of mass in a certain volume of a substance.
Density is expressed as follows:
In this case:
- density: ?
- mass: 21.1164 grams
- volume: 19.9 cm³
Replacing:
density= 1.0611
<u><em>The density of the substance is 1.0611 </em></u><u><em></em></u>