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astraxan [27]
3 years ago
15

An isotope of the element gallium has a mass of 71 and an atomic number of 31. the number of electrons, protons, and neutrons re

spectively in a neutral atoms of this isotope is
Chemistry
1 answer:
stealth61 [152]3 years ago
8 0

31, 31, 40. An atom of _31^71Ga has 31 electrons, 31 protons, and

40 neutrons.

The atomic number is 31, so the atom has<em> </em>31 protons (+).

If the atom is neutral, it must contain 31 electrons (-).

Mass number = protons + neutrons or  

A = p + n

71 = 31 + n

n = 71- 31 = 40 neutrons

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How many moles are present in 57.4 grams of sulfur dioxide (SO2)?
vlabodo [156]

Answer:

Dióxido de azufre

Densidad 26 288 kg/m³; 0,0026 g/cm³

Masa molar 64,0638 g/mol

Punto de fusión 198 K (−75 °C)

Punto de ebullición 263 K (−10 °C)

6 0
3 years ago
I need help! What arrange these elements in order of increasing density: gallium, germanium arsenic
solong [7]

Answer:

germanium -5.5g/cm^3

arsenic -5.73g/cm^3

gallium -5.91g/cm^3

Explanation:

I hope I helped

3 0
2 years ago
A 4.0 L container holds a sample of hydrogen gas at 306 K and 150 kPa. If the pressure increases to 300 kPa and the volume remai
riadik2000 [5.3K]

Answer:

612 K

Explanation:

From the question given above, the following data were obtained:

Initial temperature (T₁) = 306 K

Initial pressure (P₁) = 150 kPa

Final pressure (P₂) = 300 kPa

Volume = 4 L = constant

Final temperature (T₂) =?

Since the volume is constant, the final (i.e the new) temperature of the gas can be obtained as follow:

P₁ / T₁ = P₂ / T₂

150 / 306 = 300 / T₂

Cross multiply

150 × T₂ = 306 × 300

150 × T₂ = 91800

Divide both side by 150

T₂ = 91800 / 150

T₂ = 612 K

Thus, the new temperature of the gas is 612 K

4 0
3 years ago
Ammonia reacts with sulfuric acid to produce the important fertilizer, ammonium hydrogen sulfate.
Liula [17]

Answer:

404.8g of (NH4)HSO4 is produced.

Explanation:

Step 1:

Data obtained from the question. This include the following:

Temperature (T) = 10°C = 10°C + 273 = 283K

Pressure (P) = 110KPa = 110/101.325 = 1.09atm

Volume (V) = 75L

Step 2:

Determination of the number of mole of ammonia, NH3.

The number of mole (n) of ammonia, NH3 can be obtained by using the ideal gas equation. This is illustrated below:

Note:

Gas constant (R) = 0.0821atm.L/Kmol

Number of mole (n) =?

PV = nRT

1.09 x 75 = n x 0.0821 x 283

Divide both side by 0.0821 x 283

n = (1.09 x 75) /(0.0821 x 283)

n = 3.52 moles

Step 3:

Determination of the number of mole ammonium hydrogen sulfate produced from the reaction.

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

NH3 + H2SO4 —> (NH4)HSO4

From the balanced equation above,

1 mole of NH3 produced 1 mole of (NH4)HSO4

Therefore, 3.52 moles of NH3 will also produce 3.52 moles of (NH4)HSO4.

Therefore, 3.52 moles of ammonium hydrogen sulfate, (NH4)HSO4 is produced.

Step 4:

Conversion of 3.52 moles of ammonium hydrogen sulfate, (NH4)HSO4 to grams. This is illustrated below:

Molar Mass of (NH4)HSO4 = 14 + (4x1) + 1 + 32 + (16x4) = 115g/mol

Number of mole of (NH4)HSO4 = 3.52 moles

Mass of (NH4)HSO4 =..?

Mass = mole x molar Mass

Mass of (NH4)HSO4 = 3.52 x 115 = 404.8g

Therefore, 404.8g of (NH4)HSO4 is produced.

5 0
3 years ago
Which of these methods could are used to separate an insoluble solid and soluble solid
olasank [31]

Answer:

To separate an insoluble solid from a soluble solid: Mixing the mixture with water, filtering out the insoluble solid, and then evaporating the water to isolate the soluble solid.

Explanation:

5 0
3 years ago
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