Question

Challenge yourself: Suppose you wanted to make 100 grams of water. A. What is the molar mass of water (H2O)? B. How many moles of water are in 100 grams? C. How many moles of hydrogen will you need? D. How many moles of oxygen will you need? E. How many grams of hydrogen and oxygen will you need? Hydrogen - Oxygen - F. Is your answer reasonable? Why or why not?

Answer 1

Answer:

There are 5.55 moles of water in 100g of it. There are 6.25 moles of oxygen in 100g of Water.

Answer 2

The answers are as follows;

The answers are as follows; (A). 18 grams. (B) 5 moles. (C). 11 grams (D)44 grams (E) 11 grams of Hydrogen and 44 grams of Oxygen.

The answers are as follows; (A). 18 grams. (B) 5 moles. (C). 11 grams (D)44 grams (E) 11 grams of Hydrogen and 44 grams of Oxygen. (F) YES

GIVEN

Mass of water = 100 grams

TO FIND

A. What is the molar mass of water (H₂O)?

B. How many moles of water are in 100 grams?

C. How many moles of hydrogen will you need?

D. How many moles of oxygen will you need?

E. How many grams of hydrogen and oxygen will you need? Hydrogen - Oxygen -

F. Is your answer reasonable? Why or why not?

SOLUTION

The above problem can be simply solved as follows.

A.

Molar mass of H₂O = 2 (1) + 16

= 2 + 16 = 18 grams

B.

Number of moles in 18 grams of water = 1 mole

Number of moles in 1 gram of water = 1/18 = 0.05 moles

Number of moles in 100 grams of water = 0.05 × 100 = 5 moles

C.

Reaction between hydrogen and oxygen.

2H₂ + O₂ --------> 2H₂O

36 grams of water needs 4 grams of hydrogen.

1 gram of water will need = 4/36 = 0.11 grams

100 grams of water will need = 0.11 × 100 = 11 grams of Hydrogen.

D.

36 grams of water needs, 16 grams of oxygen.

100 grams of water - (16/36) × 100 = 44 grams

E.

11 grams of Hydrogen and 44 grams of Oxygen.

F. YES.

Hence, The answers are as follows;

Hence, The answers are as follows; (A). 18 grams. (B) 5 moles. (C). 11 grams (D)44 grams (E) 11 grams of Hydrogen and 44 grams of Oxygen.

Hence, The answers are as follows; (A). 18 grams. (B) 5 moles. (C). 11 grams (D)44 grams (E) 11 grams of Hydrogen and 44 grams of Oxygen. (F) YES

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