An acid is a hydrogen containing substance with a PH between 1-7 and is capable of donating a proton (hydrogen ion)
Mass of lead Pb = 4.00 g (given)
Density of lead= 11.34 g/mL (given)
When lead is placed in a graduated cylinder which is partially filled with water, the volume of lead will be the volume of water displaced by it.
Density (d) of a substance is the ratio of mass (m) to the volume (m) of the substance.
The formula of density is given as:
Putting the given values of density and mass of lead, we get
Rearrange the equation, to find the volume
Therefore, volume replaced by lead is 0.353 mL
The final temperature of the water will be 31.2 °C... i don’t know the second one sorry :(
The chemical reaction that occurs between , and to form cryolite (molecular formula: ) is:
The balanced reaction is:
In order to determine the weight of cryolite produced, the limiting reactant (the reactant that is completely used up in the reaction) should be identified first. To determine the limiting reactant, the number of moles of each reactant with respect to cryolite () should be calculated.
The formula for determining the number of moles is:
1. For :
According to the balanced equation, 1 mole of reacts to give 2 moles of .
Molar mass of
So,
Number of moles =
2. For :
According to the balanced equation, 6 mole of reacts to give 2 moles of .
Molar mass of
So,
The number of moles =
3. For :
According to the balanced equation, 12 moles of reacts to give 2 moles of .
Molar mass of
So,
Number of moles = .
Thus, is the limiting reactant.
Molar mass of
Amount of produced = =
Since,
Hence, the amount of cryolite produced is .