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3 years ago

Which particle makes the atom an unstable isotope?

Chemistry

1 answer:

Galina-37 [17]3 years ago

6 0

Instability of an atoms nucleus can result from an excess of either neutrons or protons . So neutrons and protons .

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A Solute is the part of the mixture that is<br> A. dissolved<br> B.used to dissolve a substance

8_murik_8 [283]

It is the thing being dissolved!!

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3 years ago

The number of atoms in 2.50 mol Cr

Slav-nsk [51]

Answer:

1.51 x 10²⁴atoms

Explanation:

Given parameters:

Number of moles of Cr = 2.50mol

Solution;

what is a mole;

a mole of any substance is the amount of substance that contains the avogadro's number of particles which is 6.02 x 10²³ particles

The particles here can be atoms, protons, neutrons, electrons e.t.c

1 mole contains 6.02 x 10²³ atoms

2.5 moles will contain 2.5 x 6.02 x 10²³ = 1.51 x 10²⁴atoms

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3 years ago

I need info on beryllium

11111nata11111 [884]

Beryllium is a chemical element with the atomic # of 4 and symbol BE

6 0

3 years ago

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Which of these scenarios involve a reaction that is at equilibrium?

Vlada [557]

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3 years ago

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How many miles of carbon dioxide gas can be produced if 25 g of cr2(co3)3 are reacted with excess nitric acid hno3 ?

Mars2501 [29]

Answer:

0.264 moles of carbon dioxide are produced.

Explanation:

<u>Limiting reagent</u> : The reactant that is consumed in a reaction is called the limiting reagent.

Molar mass = mass of substance in grams present in 1 mole of the compound.

before solving this question,

It is needed to know , the molar mass of cr2(co3)3 and CO2

Molar mass of cr2(co3)3 = 2(mass of Cr) + 3(massof C) + 9(mass of O)

= 2(52) + 3(12) + 9(16)

= 104 + 36 + 144

= 284 g

This means 1 mole of cr2(co3)3 = 284 g............(1)

Molar mass of CO2 = mass of C + 2(mass of O)

= 12 + 2(16)

= 12 + 32

= 44 g

This means 1 mole of CO2 contain 44 g of it.

So, 3 mole of CO2 contain = 44x3 g

3 mole of CO2 contain = 132 g.............(2)

The balance equation for the reaction is :

$Cr_{2}(CO_{3})_{3}+6HNO_{3}\rightarrow$

$2Cr(NO_{3})_{3} +8H_{2}O+3CO_{2}$

HNO3 = excess reagent , it can't be used in for predicting the moles of CO2

$Cr_{2}(CO_{3})_{3}$ = Limiting reagent = It will tell the amount of CO2 that will be produced

In the balanced equation ,

1 mole of cr2(co3)3 is giving = 3 mole of CO2

Use equation (1) and (2)

284 g of cr2(co3)3 is giving = 132 g of CO2

1 gram of cr2(co3)3 is giving =

$\frac{132}{284}$ g of CO2

25 g of cr2(co3)3 will give =

$\frac{132}{284}\times 25$ g of CO2

= 11.62 gram CO2

now , moles of CO2 can be calculated using ,

$moles=\frac{given\ mass}{Molar\ mass\ of\ CO2}$

$moles =\frac{11.6}{44}$ (molar mass of co2 = 44 g)

moles of CO2 = 0.264

6 0

3 years ago