3 years ago

Identify the common substance that has the highest

Chemistry

1 answer:

pshichka [43]3 years ago

8 0

Answer:

dentify the common substance that has the highest density. A) glass. B) ethanol. C) aluminum

Explanation:

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Covelant molecules are formed d

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For the complete combustion of 1.000 mole of methane gas at 298 K and 1 atm pressure, ΔH° = -890.4 kJ/mol. What will be the amou

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4 years ago

How many 1-cm cubes would it take to construct a cube that is 4 cm on edge? Express your answer using two significant figures.

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Answer:

It would take 64 1-cm cubes to construct a 4-cm cube.

Explanation:

The volume of a cube is equal to the edge raised to the power of 3.

A 1-cm edge cube has a volume of V₁ = (1 cm)³= 1 cm³

A 4-cm edge cube has a volume of V₄ = (4 cm)³= 64 cm³

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4 years ago

How much MgO is made when 12Kg of Mg is completely burned in air?

Flauer [41]

Answer:

Mass = 20,000 g

Explanation:

Given data:

Mass of MgO formed = ?

Mass of Mg react = 12 Kg (12 Kg × 1000/1 Kg = 12000 g)

Solution:

Chemical equation:

2Mg + O₂ → 2MgO

Number of moles of Mg:

Number of moles = mass/molar mass

Number of moles = 12000 g/ 24 g/mol

Number of moles = 500 mol

Now we will compare the moles of Mg and MgO.

Mg : MgO

2 : 2

500 : 500

Mass of MgO:

Mass = number of moles × molar mass

Mass = 500 mol × 40 g/mol

Mass = 20,000 g

8 0

3 years ago