Chloral hydrate (c2h3cl3o2) is a drug formerly used as a sedative and hypnotic.
a. calculate the molar mass of chloral hydrate. b. what amount (moles) of c2h3cl3o2 molecules are in 500.0 g chloral hydrate? c. what is the mass in grams of 2.0 x 10-2 mol chloral hydrate? d. what number of chlorine atoms are in 5.0 g chloral hydrate? e. what mass of chloral hydrate would contain 1.0 g cl? f. what is the mass of exactly 500 molecules of chloral hydrate?

Answer :

(a) The molar mass of is, 165.5 g/mole

(b) The moles of is, 3.02 moles

(c) The mass in grams of mole chloral hydrate is, 3.31 g

(d) The number of chlorine atoms in 5.0 g chloral hydrate is,

(e) The mass of chloral hydrate will be, 1.55 g

(f) The mass of exactly 500 molecules of chloral hydrate is,

Explanation :

(a) To calculate the molar mass of chloral hydrate.

The formula of chloral hydrate is,

Atomic mass of carbon = 12 g/mole

Atomic mass of hydrogen = 1 g/mole

Atomic mass of oxygen = 16 g/mole

Atomic mass of chlorine = 35.5 g/mole

Now we have to determine the molar mass of chloral hydrate.

=2(12g/mole)+3(1g/mole)+3(35.5g/mole)+2(16g/mole)=165.5g/mole[/tex]

The molar mass of is, 165.5 g/mole

(b) Now we have to determine the moles of .

The moles of is, 3.02 moles

(c) Now we have to determine the mass in grams of mole chloral hydrate.

The mass in grams of mole chloral hydrate is, 3.31 g

(d) To calculate the number of chlorine atoms are in 5.0 g chloral hydrate.

First we have to determine the moles of .

Now we have to calculate the number of chlorine atoms in chloral hydrate.

In , there are, 2 carbon atoms, 3 hydrogen atoms, 3 chlorine atoms and 2 oxygen atoms.

As, 1 mole of contains chlorine atoms

So, 0.03 mole of contains chlorine atoms

The number of chlorine atoms in 5.0 g chloral hydrate is,

(e) To calculate the mass of chloral hydrate would contain 1.0 g Cl.

As, of chlorine present in 165.5 g of

So, 1 g of chlorine present in of

The mass of chloral hydrate will be, 1.55 g

(f) To calculate the mass of exactly 500 molecules of chloral hydrate.

As, molecules of chloral hydrate has 165.5 g mass of chloral hydrate

So, 500 molecules of chloral hydrate has mass of chloral hydrate

The mass of exactly 500 molecules of chloral hydrate is,

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons

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