Question

Calculate the number of atoms in a 1.74 × 10^{3} g
sample of carbon.

Answer #1

**Mass of C = 1.74 *10^3 g = 1740 g
Molar mass of C = 12 g/mol
So,
number of moles of C = mass / mnolar mass
= 1740/12
= 145 mol
1 mol = 6.022*10^23 atoms**

**So,
number of atoms = number of moles * 6.022*10^23
= 145 * 6.022*10^23
= 8.73*10^25 atoms
Answer: 8.73*10^25 atoms**

A sample of C3H8 has 2.40 *
1024 atoms.
How many carbon atoms does the sample contain?
? C atoms
What is the total mass of the sample?
? g C3H8

Calculate...
1) The number of carbon atoms in 450.0g
C10H22
2)The number of sulfate ions in 15.65g
Fe2(SO4)3

Calculate the number of atoms in 58.7 g of
NH4NO2. Ans: 4.42 x 1024
atoms

(a) Calculate the number of oxygen molecules and the
number of oxygen atoms in 34.5 g of
O2.
oxygen molecules =
×
10
oxygen atoms
=
×
10
Enter your answers in scientific notation.
(b) Calculate the mass of 8.99
×
1014 SO3
molecules.
×
10
g
Enter your answer in scientific notation.

1) A sample of C3H8 has 7.76 ×
1024 H atoms. How many carbon atoms does the sample contain?
What is the total mass of the
sample?
2) Calculate the
molar mass of each compound given
below. Keep at least one decimal place in atomic masses from the
periodic table.
a. KBr g/mol:
b.Na2s g/mol:
3) A chemist requires 0.885 mol
Na2CO3 for a reaction. How many grams does this correspond
to?

22. Calculate the number of moles of the following atoms or
molecules: (a) 21.50 g of arsenic
(b) 66.50 g of fluorine atoms
(c) 2431 g of magnesium
(d) 15 g of chromium (III) oxide. (e) 0.0015 g of Cu(NO3)2
(f) 15.6 kg of silver chloride.
(g) 6.022x1023 molecules of N2 (h) 10 atoms of lithium.

1)
How many atoms of carbon are present in 1.0 g of
C6H12O6?
atoms C
2)
Consider samples of phosphine (PH3), water
(H2O), hydrogen sulfide (H2S), and hydrogen
fluoride (HF), each with a mass of 105 g. Rank the compounds from
least to the greatest number of hydrogen atoms contained in the
samples.
(Express your answer as a chemical formula.)
<
<
<
3)
Determine the number of moles for each compound.
(Enter your answer to four significant figures.)
Compound...

Determine the number of atoms in each sample.
a. 10.0 g Sr
b. 10.0 g Mg
c. 28.5 kg Zn

a) calculate the total number of hydrogen atoms (the
actual number, not the number of moles) in 1.78 g NH3.
b) determine the mass percent of hydrogen in 1.78 g NH3.

A sample of glucose, C6H12O6, contains 1.300×1021 carbon
atoms.

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