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Answered

Learning Task 1: For you to have a feel on how it is being done, you may answer
the following questions below.
1. How many mongo seeds are equal to 3.50 moles of mongo seeds?
2. How many bananas are equal to 7.50 moles of bananas?
3. How many moles of rice grains are equal to 1.807 x 1024 grains of rice?
E
paper.
Learning Task 3: Solve the following problems below. Do this in a separate sheet of
NNG
1. Gold (Au) has been used to make ornamental objects and jewelry for thousands of
years. Gold nuggets found in a stream are very easy to work and were probably
one of the first metals used by humans. (1 mol of Gold (Au) = 196.97g). Calculate
the:
A. Number of moles in a 95.0 g sample of a gold nugget.
MD
B. Number of atoms in a 95.0 g sample of a gold nugget.
2. During exercise, lactic acid (C3H603) forms in the muscles causing muscle cramp.
If 5.0 g of lactic acid (C3H603) concentrate in your leg muscles, how many
molecules of lactic acid is causing you pain? (C = 12.0 g/mol, H = 1.008 g/
O = 16.0 g/mol)
LAB 8/10​

Sagot :

Solution (1A)

[tex]\text{moles of Au = 95.0 g Au} × \frac{\text{1 mol Au}}{\text{196.97 g Au}}[/tex]

[tex]\boxed{\text{moles of Au = 0.4823 mol}}[/tex]

Solution (1B)

[tex]\text{number of Au atoms = 95.0 g Au} × \frac{\text{1 mol Au}}{\text{196.97 g Au}} × \frac{\text{6.022 × 10²³ Au atoms}}{\text{1 mol Au}}[/tex]

[tex]\boxed{\text{number of Au atoms = 2.904 × 10²³ atoms}}[/tex]

Solution (2)

Step 1: Calculate the molar mass of C₃H₆O₃.

molar mass = (12.0 g/mol × 3) + (1.008 g/mol × 6) + (16.0 g/mol × 3)

molar mass = 90.05 g/mol

Step 2: Calculate the number of molecules of C₃H₆O₃.

[tex]\text{number of C₃H₆O₃ molecules = 5.0 g C₃H₆O₃} × \frac{\text{1 mol C₃H₆O₃}}{\text{90.05 g C₃H₆O₃}} × \frac{\text{6.022 × 10²³ C₃H₆O₃ molecules}}{\text{1 mol C₃H₆O₃}}[/tex]

[tex]\boxed{\text{number of C₃H₆O₃ molecules = 3.34 × 10²² molecules}}[/tex]

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