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4 years ago

When an atom forms chemical bonds, its_becomes more stable

Chemistry

1 answer:

boyakko [2]4 years ago

7 0

Answer:

They become more stable when they satisfy the octet rule.

Explanation:

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Suppose that coal of density 1.5 g/cm^3 is pure carbon. (It is, in fact, much more complicated, but this is a reasonable first a

NISA [10]

Answer:

q = -6464.9 kJ

Explanation:

We are given that the heat of combustion is ∆H° = −394 kJ per mol of carbon.Therefore what we need to do is calculate how many moles of C are in the lump of coal by finding its mass since the density is given.

vol = 5.6 cm x 5.1 cm x 4.6 cm = 131.38 cm³

m = d x v = 1.5 g/cm³ x 131.38 cm³ = 197.06 g

mol C = m/MW = 197.06 g/ 12.01g/mol = 16.41 mol

q = −394 kJ /mol C x 16.41 mol C = -6464.9 kJ

7 0

3 years ago

The tablet has a mass of 1.20 g and contains 700 mg of lithium carbonate.

kondaur [170]

Answer:

The right answer is "58.3%".

Explanation:

The given values are:

Mass of lithium carbonate,

= 700 mg

i.e.,

= 0.7 g

Mass of tablet,

= 1.20 g

Now,

The percentage of active ingredient will be:

= $\frac{Mass \ of lithium \ carbonate}{Mass \ of \ tablet}\times 100$

On substituting the given values, we get

= $\frac{0.7}{1.20}\times 100$

= $0.583\times 100$

= $58.3$ %

4 0

3 years ago

Copper sulfate forms blue crystals. The solubility of blue copper sulfate is 32 g per 100g of water at 20 Celsius

Zanzabum

Answer:

nnnnnnnkkkmn

fhhjvvcGM NBCvvv

6 0

3 years ago

A pressure cooker contains 5.68 liters of air at a temperature of 394 K. If the absolute pressure of the air in the pressure coo

Arturiano [62]

Answer:

Explanation:

We shall find out volume of air at NTP or at 273 K and 10⁵ Pa ( 1 atm )

Let it be V₂

$\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}$

$\frac{2\times 10^5\times 5.68}{394} =\frac{10^5\times V_2}{273}$

V₂ = 7.87 litres

22.4 litres of any gas is equivalent to 1 mole

7.87 litres of air will be equivalent to

7.87 / 22.4 moles

= .35 moles .

7 0

3 years ago

Joseph Priestley discovered and described the chemical properties of oxygen. What type of chemist would he be considered today?

salantis [7]

The Answer is inorganic chemist

6 0

3 years ago