Question

Guys plz give quick answers........fast chemistry


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Answer 1

Step-by-step explanation:

1. 0.375 moles

2. 1.11111 mole

3. 0.5 mole

1. 16*0.2=3.2 u

2. 9 grams

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Answer 2

Step-by-step explanation:

the mass of oxygen gas as 12 grams. Molar mass = 2×16 = 32 grams. We know the formula to calculate the number of moles. = 0.375 moles.

Mass of water = 20 g

The Molecular mass of the water = 2 * Mass of Hydrogen + Mass of Oxygen

= 2 * 1 + 16

= 18 g.

Now, Number of moles :

given mass / molar mass

so ans is 1.11 moles

(Atomic masses : C=12u,O=16u) So, the mass of 1 mole of carbon dioxide is 44 grams. Thus, 22 grams of carbon dioxide are equal to 0.5 mole.

Mass of one mole of oxygen atoms = 16 g

Then, mass of 0.2 mole of oxygen atoms = 0.2 x 16g = 3.2 g

Mass of one mole of water molecule = 18 g

Then, mass of 0.5 mole of water molecules = 0.5 x 18 g = 9 g

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