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Dmitry_Shevchenko [17]
3 years ago
10

An ion has 33 protons, 41 neutrons, and 36 electrons. What is the mass number of this atom?​

Chemistry
1 answer:
pogonyaev3 years ago
6 0

Answer:

74

Explanation: Mass number = protons + neutrons

Mass number = 33 + 41

Mass number = 74

The mass number of this atom is 74

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Explanation:

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A sample of gas at 25ºc has a volume of 11 l and exerts a pressure of 660 mm hg. how many moles of gas are in the sample?
san4es73 [151]
  The  moles of  the gas    in the sample  is 0.391  moles

    calculation
by use  of  ideal  gas  equation, that  is Pv=nRT
where  n  is number  of moles
           P(pressure)= 660  mmhg
           R(gas  constant)  =  62.364 l.mmhg/mol.K
           T(temperature)= 25 +273 =   298 k

by  making  n  the subject of the  formula

n= Pv/ RT

n is therefore=   (660mm hg  x11 L)/(  62.364 L.mmhg/mol.k  x298 K)  = 0.391  moles
5 0
4 years ago
Identify the missing species in each nuclear equation. Replace the question marks with the appropriate integer or symbol. Be410⟶
astraxan [27]

Answer:

1.  ¹⁰₄Be ---> ¹⁰₅B + ⁰₋₁β

2. ³⁴₁₄Be ---> ³⁴₁₅P + ⁰₋₁β

3. ¹⁹²₇₈Pt -----> ¹⁹⁰₇₆Os + ⁴₂α

4.  ²⁸₁₂Mg ---> ²⁸₁₃Al + ⁰₋₁β

Explanation:

1. In the first equation, Beryllium-10 isotope undergoes beta-decay, emitting a beta-particle to form boron-10 isotope. The balanced nuclear equation is given below:

¹⁰₄Be ---> ¹⁰₅B + ⁰₋₁β

2. In this reaction, silicon-34 isotope undergoes beta-decay, emitting a beta-particle to form phosphorus-34 isotope. The balanced nuclear equation is given below:

³⁴₁₄Be ---> ³⁴₁₅P + ⁰₋₁β

3. In this equation, platinum-192 isotope undergoes alpha-particle decay emitting an alpha-particle to form osmium-190 isotope. The balanced nuclear equation is given below:

¹⁹²₇₈Pt -----> ¹⁹⁰₇₆Os + ⁴₂α

4. In this equation, magnesium-28 isotope undergoes beta-decay, emitting a beta-particle to form aluminum-28 isotope. The balanced nuclear equation is given below:

²⁸₁₂Mg ---> ²⁸₁₃Al + ⁰₋₁β

8 0
3 years ago
Many chemistry problems result in equations of the form
Gnom [1K]

Answer:

When this equation is solved, the two values of the unknown are 0.0643 and -0.082

Explanation:

Given

1.77 * 10^{-2} = \frac{x^2}{0.298 - x} --- the actual equation

Required

The values of x

We have:

1.77 * 10^{-2} = \frac{x^2}{0.298 - x}

Cross Multiply

1.77 * 10^{-2} * (0.298 - x)= x^2

Multiply both sides by 100

1.77  * (0.298 - x)= 100x^2

Open bracket

0.52746 - 1.77x= 100x^2

Rewrite as:

100x^2 + 1.77x - 0.52746 =0

Using quadratic formula:

x = \frac{-b \± \sqrt{b^2 - 4ac}}{2a}

Where:

a = 100; b = 1.77; c = -0.52746

So, we have:

x = \frac{-1.77 \± \sqrt{1.77^2 - 4*100*- 0.52746 }}{2*100}

x = \frac{-1.77 \± \sqrt{214.1169}}{2*100}

x = \frac{-1.77 \± 14.63}{200}

Split

x = \frac{-1.77 + 14.63}{200}\ or\ x = \frac{-1.77 - 14.63}{200}

x = \frac{12.86}{200}\ or\ x = \frac{-16.40}{200}

x = 0.0643\ or\ x = -0.082

3 0
3 years ago
Define relative atomic mass?​
SVEN [57.7K]

Answer:

The relative atomic mass of an element is defined as the weight in grams of the number of atoms of the element contained in 12.00 g of carbon-12.

Or

Its just another term for atomic mass.

Explanation:

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2 years ago
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