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2 years ago

When elements react they can form molecules. What else might they form?

Chemistry

1 answer:

vova2212 [387]2 years ago

7 0

Answer:

Elements combine to form chemical compounds that are often divided into two categories

When two or more atoms chemically bond with each other, the resultant chemical structure is a molecule.

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A mixture of 50.0 mL of ammonia gas and 60.0 mL of oxygen gas react. If all the gases are at the same temperature and pressure,

fredd [130]

Answer:

72.0 mL of steam is formed.

Explanation:

The reaction is :

$4 NH_{3} + 5O_{2} \rightarrow 4NO+6H_{2} O$

You can treat coefficient of compounds as amount of volume used.

Therefore for 4 mL of ammonia 5 mL of oxygen is used to form 4 mL of nitric oxide gas and 6 mL of steam.

For 1 mL of ammonia $\frac{5}{4}$ (=1.25) mL of oxygen is used to form $\frac{4}{4}$ (=1) mL of nitric oxide gas and $\frac{6}{4}$ (=1.5) mL of steam.

Just transform the chemical equation by dividing the whole equation by 4 so that the coefficient of $NH_{3}$ become one like this

$NH_{3} + \frac{5}{4} O_{2} \rightarrow \frac{4}{4}NO+\frac{6}{4}H_{2} O$

We don't know which one will be completely exhausted and which one will be left so we have to consider two cases :

1. Assume ammonia to be completely exhausted

For 50 mL of ammonia $50 \times \frac{5}{4}$ (= 62.5) mL of oxygen is needed. But we have just 60 mL of oxygen so this assumption is false.

2. Assume oxygen to be completely exhausted

For 60 mL of oxygen only $60 \times \frac{4}{5}$ (=48) mL of ammonia is needed. In this case we have sufficient amount of ammonia. So this case is true.

$60\times\frac{4}{5}NH_{3} + 60\ O_{2} \rightarrow 60\times\frac{4}{5}NO+60\times\frac{6}{5}H_{2} O\\\\48NH_{3} + 60\ O_{2} \rightarrow 48NO+72H_{2} O$

Now we know that during complete reaction 48 mL of ammonia and 60 mL of oxygen is used which will form $60 \times \frac{4}{5}$ (= 48) mL of nitic oxide gas and $60 \times \frac{6}{5}$ (= 72) mL of steam.

Therefore 72 mL of steam is formed.

5 0

2 years ago

Read 2 more answers

i want to find the volume of a block of wood it has a length of 6 inches a width of 7 inces and a height of 8 inches what is the

JulijaS [17]

Answer:

336

Explanation:

L x w x h= 6 x 7 x 8 = 336

8 0

2 years ago

The diameter of a hydrogen atom is approximately 1.06 ✕ 10−10 m, as defined by the diameter of the spherical electron cloud arou

mylen [45]

Answer:

a) 10.0 mm

b) 8.7 x 10¹³ times

Explanation:

Atom diameter = 1.06 x 10⁻¹⁰ m ________________ 100%

Nucleus diameter = 2.40 x 10⁻¹⁵ m ______________ x

x = 2.26 x 10⁻³ %

The nucleus diameter is equivalent to 2.26 x 10⁻³ % of the total atom size.

a) The Empire State Building model:

1 ft = 304.8 mm

1454 ft = 443179.2 mm

443179.2 mm______ 100%

y ______ 2.26 x 10⁻³ %

y = 10.0 mm

In this model, the diameter of the nucleus would be 10.0 mm.

b) Sphere volume: V =(4 · π · r³ )/3

V atom = (4 . π .( 0.53x10⁻¹⁰)³ )/3

V atom = 6.2 x 10⁻³¹ m³

V nucleus = (4 . π .( 1.2x10⁻¹⁵)³ )/3

V nucleus = 7.2 x 10⁻⁴⁵ m³

V atom / V nucleus = 6.2 x 10⁻³¹ m³ / 7.2 x 10⁻⁴⁵ m³

V atom / V nucleus = 8.7 x 10¹³

The atom is times 8.7 x 10¹³ larger in volume than its nucleus.

6 0

3 years ago

Which 2 elements make up more than 80% of the atoms found in the Earth's crust

mars1129 [50]

oxygen and silicon I believe

6 0

3 years ago

Here is a multiple choice I need help on:

Ivenika [448]

I'm pretty sure it's B because carbon atoms are in all living organisms. They can also be bonded in different varations.

3 0

3 years ago