How to balance Mg3n2+H20>>Mg(oh)2+Nh3?

HELP

Wittaler [7]

Answer:

Explanation:

1.

Given parameters:

Number of moles of CaO = 0.22moles

Unknown:

Mass of CaO = ?

Solution:

Mass, number of moles and molar mass are related using the expression below;

Mass = number of moles x molar mass

Molar mass of CaO = 40 + 16 = 56g/mol

Insert the parameters and solve;

Mass = 0.22 x 56 = 12.32g

2

Given parameters:

Number of moles of NaCl = 0.83moles

Unknown:

mass of NaCl = ?

Solution:

Also,

Mass = number of moles x molar mass

Molar mass of NaCl = 23 + 35.5 = 58.5g/mol

Now insert the parameters and solve;

mass = 0.83 x 58.5

mass = 48.6g

3.

Given parameters:

Number of moles of H₂SO₄ = 0.5moles

Unknown:

mass of H₂SO₄ = ?

Solution:

Mass = number of moles x molar mass

Molar mass of H₂SO₄ = 2(1) + 32 + 4(16) = 98g/mol

Insert the parameters and solve;

Mass = 0.5 x 98 = 49g

8 0

3 years ago

Why do scientists use SI?

garik1379 [7]

The SI system, also called the metric system, is used around the world. There are seven basic units in the SI system: the meter (m), the kilogram (kg), the second (s), the kelvin (K), the ampere (A), the mole (mol), and the candela (cd).

3 0

4 years ago

Read 2 more answers

If 100.0g of nitrogen is reacted with 100.0g of hydrogen, what is the excess reactant? What is the limiting reactant? Show your

Drupady [299]

N₂ : limiting reactant

H₂ : excess reactant

<h3>Further explanation</h3>

Given

mass of N₂ = 100 g

mass of H₂ = 100 g

Required

Limiting reactant

Excess reactant

Solution

Reaction

N₂+3H₂⇒2NH₃

mol N₂(MW=28 g/mol) :

$\tt mol=\dfrac{mass}{MW}=\dfrac{100}{28}=3.571$

mol H₂(MW= 2 g/mol) :

$\tt mol=\dfrac{100}{2}=50$

A method that can be used to find limiting reactants is to divide the number of moles of known substances by their respective coefficients, and small or exhausted reactans become a limiting reactants

From the equation, mol ratio N₂ : H₂ = 1 : 3, so :

$\tt \dfrac{3.571}{1}\div \dfrac{50}{3}=3.571\div 16.6$

N₂ becomes a limiting reactant (smaller ratio) and H₂ is the excess reactant

5 0

3 years ago

Balance the following reaction. A coefficient of "1" is understood. Choose option "blank" for the correct answer if the coeffici

CaHeK987 [17]

Answer : To balance a chemical equation you need to find the same number of molecules on both the sides of the reaction.

Here in the reaction ;

$KI + Pb (NO_{3})_{2}----\ \textgreater \ Pb I_{2} + KNO_{3}$

here we can see that I is not balanced so we need to balance that,
also nitrate is unbalanced we need to work on that as well.

so on solving we get,
$2KI + Pb (NO_{3})_{2}----\ \textgreater \ Pb I_{2} + 2KNO_{3}$

4 0

3 years ago

The diagram above is a potential energy curve for a reaction which number represents the effects of a catalyst from the reaction

marta [7]

As we cannot see the diagram or numbers, I can't tell you the number, but it would be the curved line drawn under the original curve of the diagram.

7 0

4 years ago