Answer: the correct answer is (A).
Explanation:
Structural formula not only tells us about the number and types of atoms in a molecule but also tells us about the bonded positions of all the atoms in a molecule of that particular compound.
Molecular structure only tells us about the numbers of atoms and types of atoms present in a molecule of that particular compound.
For example: Molecular formula of propanone and propanal are same that is 
but structural formula is different that 
for propane and 
for propanal. Here structural formula is showing that how the atoms in propanone and propanal are bonded together.
Hence, the correct answer is option (A).
Answer:
90g
Explanation:
The equation for the reaction is given below:
2H2 + O2 → 2H2O
From the equation above,
1 mole of O2 produced 2 moles of H2O.
Therefore, 2.5 moles of O2 will produce = 2.5 x 2 = 5 moles of H2O.
Now let us convert 5 moles to H2O to grams to obtain the desired result. This is shown below:
Molar Mass of H2O = (2x1) + 16 = 2 + 16 = 18g/mol
Number of mole of H2O = 5 moles
Mass of H2O = ?
Mass = number of mole x molar Mass
Mass of H2O = 5 x 18 = 90g
Therefore, 90g of H2O are produced
I think the best way to explain it is that the water at the poles and in the equators is that temperature of the water at the poles are mostly low because of the insufficient heat energy and the water in the poles has a higher temperature compare to the water in the poles.
<u>Answer:</u> The volume of concentrated hydrochloric acid required is 16.53 mL
<u>Explanation:</u>
To calculate the volume of concentrated solution, we use the equation:
where,
are the molarity and volume of the concentrated solution
are the molarity and volume of diluted solution
We are given:
Conversion factor: 1 L = 1000 mL
Putting values in above equation, we get:
Hence, the volume of concentrated hydrochloric acid required is 16.53 mL
we find the number of moles with the formula
pV=nRT
27C=300k
3.2*30=n*0.082*300
n=96/24.6=3.9 moles
we have the mass ant the number of moles so we can calculate the molar mass
283.3/3.9=72.64g/moles
that means X's mass is 72.64/2=36.3 so the element is Kr(Kriptonium)
