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3 years ago

Determine a massa de um átomo de carbono12 em gramas

Chemistry

2 answers:

Anon25 [30]3 years ago

7 0

The mass of an atom of carbon-12 is 1.993 × 10⁻²³ g.

1 C atom has a mass of 12 u.

1 mol of C atoms has a mass of 12 g.

∴ Mass of 1 C atom = 12 g/6.022 × 10²³ C atoms = 1.993 × 10⁻²³ g

lapo4ka [179]3 years ago

3 0

I believe it would be 1.660539040 × 10−24 gram.

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5. 1.00 mol HNO3 is treated with 4.47 g of magnesium. Calculate the number of moles of

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Answer:

The balanced equation is:

2 HNO3 + Mg ---> Mg(NO3)2 + H2

From the equation, we can see that we need twice the moles of HNO3 than the moles of Mg

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Molar mass of Mg = 24 g/mol

Moles = Given mass / Molar Mass

Moles of Mg = 4.47 / 24 = 0.18 moles (approx)

Hence, 2(moles of Mg) = 0.36 moles of HNO3 will be consumed

Number of moles of HNO3 after the reaction is finished is the number of unreacted moles of HNO3

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Unreacted moles of HNO3 = 0.64 moles (approx)

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3 years ago

Cars run on gasoline, where octane (C8H18) is the principle component. This combustion reaction is responsible for generating en

Bezzdna [24]

Answer:

10.19 g CO₂

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Explanation:

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Now we convert 1.24 gallons to mL:

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H₂O ⇒ 3.30 g Octane ÷ 114g/mol * $\frac{9molH_{2}O}{1molOctane}$ * 18 g/mol = 4.69 g H₂O

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