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nata0808 [166]
3 years ago
13

Which element is used in light bulbs as filament

Chemistry
1 answer:
Sergeeva-Olga [200]3 years ago
8 0
The answer is tungsten.
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A sample of copper with a mass of 63.5g contains 6.02 x10^23 atoms calculate the mass of an average copper atom
romanna [79]

Answer:

1.024 x 10⁻²²g

Explanation:

Data Given:

mass of copper = 63.5 g

no. of atoms of copper = 6.02 x10²³ atoms

mass of of an average copper = ?

Solution:

As 6.02 x10²³ atoms have 63.5 g of mass then what will be the mass of atom.

Apply unity formula

                     63.5 g of copper ≅ 6.02 x10²³ atoms of copper

                     mass of copper atom ≅ 1 atom of copper

Do cross multiplication

                     mass of copper atom = 1 atom x 63.5 g / 6.02 x10²³ atoms

                     mass of copper atom = 1.024 x 10⁻²² g

mass of an average copper atom = 1.024 x 10⁻²² g

6 0
3 years ago
An electrolyte can be checked to ensure that it has correct chemical composition by measuring its _____.
UNO [17]

Answer:

specific gravity

Explanation:

3 0
2 years ago
Draw Au3N as a picture of atoms
Shkiper50 [21]

The picture of Au₃N is attached below.

The first part of the picture shows the formation of Au and N ions.

Formation of Au⁺¹ :

                            As Gold has one valence electron in 6s¹ therefore, it will loose it to form Au⁺¹. In case of Au₃N three atoms of Au looses three electrons to form three Au⁺¹ ions.

Formation of N⁻³ :

                            As Nitrogen has 5 valence elctrions therefore, it will gain three electrons that lost by Au to form Nitrite (i.e. N⁻³)

Formation of Au₃N:

                                Three cations of Au⁺ combines with one anion of N⁻³ to form a neutral ionic compound i.e. Au₃N as shown in second part of the picture.

7 0
3 years ago
What happens to solubility when the solute is crushed before adding to water
marusya05 [52]
It will dissolve faster as the surface area is more so more particles collide ---> faster dissolving
6 0
3 years ago
I will give brainliest if done well.
topjm [15]

Answer:

8.37g

Explanation:

Step 1 :

The balanced equation for the reaction. This is given below:

N2 + 2O2 —> 2NO2

Step 2:

Data obtained from the question.

Volume (V) of N2 = 2L

Pressure (P) = 840mmHg

Temperature (T) = 24°C

Number of mole (n) of N2 =?

Step 3:

Conversion to appropriate unit.

For pressure:

760mmHg = 1atm

840mmHg = 840/760 = 1.11 atm

For Temperature:

T(K) = T(°C) + 273

T(°C) = 24°C

T(K) = 24°C + 273

T(K) = 297K

Step 4:

Determination of the number of mole N2.

The number of mole of N2 can be obtained by using the ideal gas equation as follow:

Volume (V) of N2 = 2L

Pressure (P) = 1.11 atm

Temperature (T) = 297K

Number of mole (n) of N2 =?

Gas constant (R) = 0.082atm.L/Kmol

PV = nRT

Divide both side by RT

n = PV / RT

n = 1.11 x 2 / 0.082 x 297

n = 0.091 mole

Therefore, the number of mole of N2 that reacted is 0.091 mole

Step 5:

Determination of the mass of NO2 produced from the reaction. This is illustrated below:

N2 + 2O2 —> 2NO2

From the balanced equation above,

1 mole of N2 produced 2 moles of NO2.

Therefore, 0.091 mole of N2 will produce = 0.091 x 2 = 0.182 mole of NO2.

Finally, we will convert 0.182 mole of NO2 to gram as shown below:

Number of mole NO2 = 0.182 mole

Molar mass of NO2 = 14 + (16x2) = 46g/mol

Mass = number of mole x molar mass

Mass of NO2 = 0.182 x 46

Mass of NO2 = 8.37g

7 0
3 years ago
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