Explanation:
The given data is as follows.
Heat of vaporization (
) = 45.4 kJ/mol
Specific heat (
) = 0.903 
Let us assume the alcohol given is 
and its mass is 1.12 g. Also, mass of aluminium block is 73.0 g.
First, calculate the moles of alcohol () as follows.
No. of moles alcohol = 
= 
= 0.0186 mol
So, heat absorbed by the alcohol (
) = heat lost by aluminium (
)
= 
12.71 = 
Thus, we can conclude that the final temperature of the block is 12.3^{o}C[/tex].
We are given the number of moles of solid magnesium supplied for the reaction which is 0.02 moles while hydrochloric acid is supplied in excess thus we can say that the reaction proceeds to completion. Calculation is as follows:
0.020 mol Mg ( 1 mol H2 / 1 mol Mg ) = 0.020 mol H2 gas is produced
To convert the number of moles to volume, we use the conditions at STP of 1 mol of a substance is equal to 22.4 L. Thus,
0.020 mol H2 (22.4 L / 1 mol) (1000 mL / 1 L) = 448 mL
The subscript is the amount of atoms in each molecule and the coefficient is the amount of molecules. there are 4 Hydrogen, 2 Sulfur, and 8 Oxygen in this particular substance.
Answer:
When magma cools, crystals form because the solution is super-saturated with respect to some minerals. If the magma cools quickly, the crystals do not have much time to form, so they are very small. If the magma cools slowly, then the crystals have enough time to grow and become large.
Explanation:
