3.47 x atoms of gold have mass of 113.44 grams.
Explanation:
Data given:
number of atoms of gold = 3.47 x
mass of the gold in given number of atoms = ?
atomic mass of gold =196.96 grams/mole
Avagadro's number = 6.022 X
from the relation,
1 mole of element contains 6.022 x atoms.
so no of moles of gold given =
0.57 moles of gold.
from the relation:
number of moles =
rearranging the equation,
mass = number of moles x atomic mass
mass = 0.57 x 196.96
mass = 113.44 grams
thus, 3.47 x atoms of gold have mass of 113.44 grams
Answer:
question 1 i believe is c i will put the other answeres in comments
when i finish the test
Explanation:
Answer: 10.1mL
Explanation:
To solve this problem, let's generate the equation:
HCl + AgNO3 —> AgCl + HNO3
Next, we find the amount of AgNO3 in 12mL of the solution.
12mL = 0.012L
If 0.16mol of AgNO3 dissolves in 1L of solution,
Therefore Xmol will dissolve in 0.012L i.e
Xmol of AgNO3 = 0.16x0.012 = 0.00192mol
From the equation, 1mole of AgNO3 required 1mole HCl.
This implies that 0.00192mol of AgNO3 will also require 0.00192mol of HCl.
From this result, we can calculate the Volume of HCl that is needed for the reaction. This is done by:
Molarity = mole /Volume
Molarity = 0.19M
Mole = 0.00192mol
Volume =?
Volume = mole / Molarity
Volume = 0.00192 / 0.19
Volume = 0.0101L = 10.1mL
Therefore the volume of HCl needed is 10.1mL
<span>An example of a homologous structure is the forelimb of a whale, a human, and a dog.
Homologous structures have the same structure, but may have a different function.
Homologous structures indicate a common ancestor.
A homologous structure is an organ or bone that's in common between different animals that demonstrates an anatomical commonality indicating that the animals share a common ancestor. This is in contrast to analogous structures where two unrelated animals have structures with similar forms or functions due to convergent evolution. With that in mind, let's look at the available options and see what fits.
An example of a homologous structure is the wing of a bird and an insect.
* This is an example of an analogous structure, so this is a bad choice.
An example of a homologous structure is the forelimb of a whale, a human, and a dog.
* Exactly. This is a good example of a homologous structure, so this is a good choice.
Homologous structures have the same function but a different structure.
* False. This is a type of analogous structure.
Homologous structures have the same structure, but may have a different function.
* True. A homologous structure is a structure that was present in a common ancestor of different animals. Further evolution may have caused those animals to diverge and the common structure may now be used for different purposes. So this is a good choice.
Homologous structures indicate a common ancestor.
* Yes, by definition.
Homologous structures do not indicate a common ancestor.
* Since the previous option was true, this must be false, so a bad choice.</span>