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2 years ago

How many moles of oxygen are required to make 4 moles of water?

Chemistry

2 answers:

kakasveta [241]2 years ago

8 0

Answer:

2 moles of oxygen

Explanation:

Basic Equation (given) :

2H₂ (g) + O₂ ⇒ 2H₂O (g)

From this, we understand for every 2 moles of water, 1 mole of oxygen is needed

Taking the number of moles of oxygen and water in proportion :

1 : 2
1 × 2 : 2 × 2
2 : 4

Therefore, 2 moles of oxygen are required to make 4 moles of water.

frozen [14]2 years ago

6 0

$\textsf{\qquad\qquad\huge\underline{{\sf Answer}}}$

As per the given equation, we can infer that :

For getting 2 moles mole of water, 1 mole of oxygen gas was required. so to get 4 moles of water we need :

We just have to multiply the whole reaction by 2 on both sides, in order to get 4 moles of H2O on product side.

$\qquad \qquad \rm4 \: H_2 + 2 \: O_2 \rightarrow4 \: H_2O$

therefore, we need

$\qquad \sf \dashrightarrow \: 2 \times 1 = 2 \: moles \: \: oxygen \: gas$

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3 years ago

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3 years ago

Which of the following represents the least number of molecules?

lozanna [386]

Answer:

A ; 20g of water has the least number of molecules

Explanation:

Here, we want to know which of the options represent the least number of molecules;

To calculate this, we are going to first calculate the number of moles using the formula below;

Number of moles = mass/molar mass

Then from the number of moles, we can calculate the number of molecules by multiplying the number of moles by 6.02 * 10^23 molecules

Let’s proceed;

a. That will be 20/18.02 = 1.1099 moles

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c. That will be 68/42.09 = 1.62 moles

1.62 * 6.02 * 10^23 = 9.73 * 10^23 molecules

d. That will be 100/44.02 = 2.27 moles

2.27 * 6.02 * 10^23 = 1.37 * 10^24 molecules

e. That will be = 84/20.01 = 4.2 moles

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3 years ago

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How many moles of oxygen are required to make 4 moles of water?​

How many moles of oxygen are required to make 4 moles of water?