Answer:
The answer is
<h2>2.64 g/mL</h2>
Explanation:
The density of a substance can be found by using the formula

From the question
mass = 611 g
volume = final volume of water - initial volume of water
volume = 256.7 - 25.1 = 231.6 mL
The density of the metal is

We have the final answer as
<h3>2.64 g/mL</h3>
Hope this helps you
Answer:
The darkness of the green color produced in the beakers is different because the concentration of magnesium hydroxide is different in both beakers.
Explanation:
The reason why the flasks have different color intensity is related to the concentration of magnesium hydroxide.
An indicator usually changes color because its conformation changes according to the pH. The higher the base level, the pH is higher. Then the color shift will be more intense.
Beaker A has 20 ml of magnesium hydroxide and 100 ml of water and beaker B has 50ml of magnesium hydroxide and 100ml of water.
Beaker A is more diluted than beaker B.
Therefore, beaker B is greener than beaker A.
Answer:
C.
Explanation:
We are given that
Initial concentration, ![[A]_o=4.3 M](https://tex.z-dn.net/?f=%5BA%5D_o%3D4.3%20M)
First half life,
minutes
Second half life,
minutes
We have to find K.
The given reaction is zero order reaction.
We know that for zero order reaction
![t_{\frac{1}{2}}=\frac{[A]_o}{2k}](https://tex.z-dn.net/?f=t_%7B%5Cfrac%7B1%7D%7B2%7D%7D%3D%5Cfrac%7B%5BA%5D_o%7D%7B2k%7D)
Using the formula



Hence, option C is correct.
Answer: A. 5.41
Explanation:
To calculate the moles :


According to stoichiometry :
3 moles of
require = 2 moles of
Thus 0.0261 moles of
will require=
of 
Thus
is the limiting reagent as it limits the formation of product and
is the excess reagent.
As 3 moles of
give = 3 moles of 
Thus 0.0261 moles of
give =
of 
Mass of 
Thus 5.41 g of solid lead will be produced from the given masses of both reactants.