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sattari [20]
3 years ago
8

What is the mass number of an element that has 8 protons, 9 neutrons and 7 electrons?

Chemistry
2 answers:
lesya [120]3 years ago
4 0

Answer:

17

Explanation:

mass number = # of protons + # of neutrons

Reil [10]3 years ago
4 0
So the answer to your question will be 16
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Which of the following is a substance that is found between the cell membrane and the nucleus, which primarily consists of water
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The answer is B, cytoplasm
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Why does water with salt in it freeze much more slower than water without it ? Explain
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When you add salt to water, you lower to freezing point of the substance.

So for example, normal water freezes at 0°C. But water with salt in it won't freeze at 0°C, because its freezing point is lowered. 

In answer to the question. It takes longer for water with salt in it to freeze because the substance requires a lower temperature than normal water to freeze.
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A given volume of methane diffuses in 20 seconds. How long will it take the same volume of hydrogen to diffuse under the same co
Airida [17]

The time taken for the same volume of methane gas to diffuse is 7.1 s.

<h3>Rate of gas diffusion</h3>

The rate at which a given mass of diffuses is inversely proportional to the molar mass of the gas.

\frac{t_2}{t_1} = \sqrt{\frac{M_2}{M_1} }

where;

  • M1 is the molar mass of methane (CH4) = 16 g
  • M2 is the molar mass of hydrogen as = 2
  • t1 is time taken for methane = 20 s
  • t2 is the time taken for hydrogen = ?

\frac{t_2}{t_1} = \sqrt{\frac{M_2}{M_1} }\\\\\frac{t_2}{20} = \sqrt{\frac{2}{16} }\\\\\frac{t_2}{20} = \frac{\sqrt{2} }{4} \\\\t_2 = \frac{20\sqrt{2} }{4} \\\\t_2 = 5\sqrt{2} \\\\t_2 = 7.1 \ s

Thus, the time taken for the same volume of methane gas to diffuse is 7.1 s.

Learn more about rate of gas diffusion here: brainly.com/question/26696466

6 0
2 years ago
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At what temperature, in Celsius, will 88.0 g of Ne exert a pressure of 350. kPa in a
bezimeni [28]

Answer:

191 °C

Explanation:

We'll begin by calculating the number of mole in 88.0 g of Ne. This can be obtained as follow;

Mass of Ne = 88.0 g

Molar mass of Ne = 20 g/mol

Mole of Ne =?

Mole = mass /molar mass

Mole of Ne = 88 / 20

Mole of Ne = 4.4 moles

Next, we shall determine the temperature. This can be obtained as follow:

Mole of Ne = 4.4 moles

Pressure (P) = 350 KPa

Volume (V) = 48.5 L

Gas constant (R) = 8.314 KPa.L/Kmol

Temperature (T) =?

PV = nRT

350 × 48.5 = 4.4 × 8.314 × T

16975 = 36.5816 × T

Divide both side by 36.5816

T = 16975 / 36.5816

T = 464 K

Finally, we shall convert 464 K to celsius temperature. This can be obtained as follow:

T(°C) = T(K) – 273

T(K) = 464 K

T(°C) = 464 – 273

T(°C) = 191 °C

Thus, the temperature is 191 °C

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Metal elements generally demonstrate low electronegativity and low ionization energy.
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False the answer is check
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