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maksim [4K]
3 years ago
8

PART A) Theobromine, C7H8N4O2, is a component of chocolate. It is mildly diuretic, is a mild stimulant, and relaxes the smooth m

uscles of the bronchi in the lungs. Because dogs metabolize it more slowly than humans, theobromine is very toxic to dogs.
If there are 0.064 g of theobromine in a 43 g chocolate bar, how many moles of theobromine are there?
a) 1.5 x 10−3 moles
b) 3.55181 x 10−4 moles
c) 3.6 x 10−4 moles
d) 12 moles
PART B) Calculate the molarity (M) of 151.1 g of H2SO4 in 1.405 L of solution.
Express your answer to four significant figures.
part c) Sodium hydroxide, NaOH, is a strong base that is used in industrial synthesis and processes such as making paper.
What is the mass of 2.30 ×1022 molecules of NaOH (Molar mass = 40.0 g/mol)?
Express the mass in grams to three significant figures.
Chemistry
1 answer:
SIZIF [17.4K]3 years ago
7 0

Answer:

a. 3,6x10⁻⁴ moles

b. 1,096M

c. 1,53 g of NaOH

Explanation:

a. Theobromine has a molar mass of:

C: 12,01×7= 84,07 g/mol

H: 1,01×8= 8,08 g/mol

N: 14×4= 56,04 g/mol

O: 16×2= 32 g/mol

84,07 g/mol + 8,08 g/mol + 56 g/mol + 32 g/mol = 180,15g/mol. Thus, in 0,064g of theobromine are:

0,064g * \frac{1mol}{180,15g} = <em>3,6x10⁻⁴ moles </em>-two significant figures-

b. Molar mass of H₂SO₄ is 98,079 g/mol.

151,1g are:

151,1g * \frac{1mol}{98,079g} = <em>1,54 moles of H₂SO₄</em>

As molarity is moles of solute per liters of solution, molarity is:

1,54 moles of H₂SO₄ / 1,405L = <em>1,096 M</em>

c. 2,30x10²² molecules of NaOH are:

2,30x10²²molecules × (1mol/6,022x10²³molecules) = 0,0382 moles of NaOH

As molar mass of NaOH is 40,04g/mol:

0,0382 moles* \frac{40,04g}{1mol} = <em>1,53 g of NaOH</em>

I hope it helps!

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