The periodic table of elements is organized by the number of

Why shouldn’t we add water to sulfuric acid?

Kamila [148]

Answer:

If you add water to sulfuric acid, it can boil and spit and you may get a nasty acid burn.

Explanation:

5 0

3 years ago

This question involves two calculations. The answer to the first part will be

ozzi

Answer :

(a) The mass of $Al_2O_3$ produced is, 15.2 grams.

(b) The percent yield of the reaction is, 72.5 %

Explanation :

Part (a) :

Given,

Mass of $Al$ = 85.1 g

Molar mass of $Al$ = 27 g/mol

First we have to calculate the moles of $Al$

$\text{Moles of }Al=\frac{\text{Given mass }Al}{\text{Molar mass }Al}=\frac{85.1g}{27g/mol}=3.15mol$

Now we have to calculate the moles of $Al_2O_3$

The balanced chemical equation is:

$4Al+3O_2\rightarrow 2Al_2O_3$

From the reaction, we conclude that

As, 4 moles of $Al$ react to give 2 moles of $Al_2O_3$

So, 3.15 moles of $Al$ react to give $\frac{2}{4}\times 3.15=1.58$ mole of $Al_2O_3$

Now we have to calculate the mass of $Al_2O_3$

$\text{ Mass of }Al_2O_3=\text{ Moles of }Al_2O_3\times \text{ Molar mass of }Al_2O_3$

Molar mass of $Al_2O_3$ = 102 g/mole

$\text{ Mass of }Al_2O_3=(1.58moles)\times (102g/mole)=161.2g$

Therefore, the mass of $Al_2O_3$ produced is, 161.2 grams.

Part (b) :

Now we have to calculate the percent yield of the reaction.

$\text{Percent yield}=\frac{\text{Experimental yield}}{\text{Theoretical yield}}\times 100$

Experimental yield = 116.9 g

Theoretical yield = 161.2 g

Now put all the given values in this formula, we get:

$\text{Percent yield}=\frac{116.9g}{161.2g}\times 100=72.5\%$

Therefore, the percent yield of the reaction is, 72.5 %

8 0

2 years ago

What coefficients must be added to balance the following equation?_____NaOH + _____H2 SO4 _____ Na2SO4 + _____ H2O 2, 1, 1, 13,

alexgriva [62]

_____NaOH + _____H2 SO4 _____ Na2SO4 + _____ H2O ,

To balance this equation,

Step 1:

Balance the number of sodium on both side:

by multiplying the NaOH by 2 that is:

2NaOH+H2SO4-------->Na2SO4+H2O

Step2:

As NOW the number of oxygen atom and hydrogen atom are not equal on both sides. So we multiply this H2O by 2 that is:

2NaOH+H2SO4-------->Na2SO4+2H2O

Now the no of all atoms on product side is equal to no of all atoms in the reactant side.

so the coefficient is 2 NaOH+1 H2SO4-------->1 Na2SO4+2 H2O.

7 0

2 years ago

Read 2 more answers

Water can be formed according to the equation: 2h2 (g) + o2 (g) → 2h2o (g) if 8.0 l of hydrogen is reacted at stp, exactly how m

Ket [755]

Four litre of oxygen will be required

8 0

3 years ago

Read 2 more answers

Compare the occurrence of heavier elements on earth and the universe.

k0ka [10]

By definition, a heavy element is a specific kind of element with a larger atomic mass. An element could be considered as "heavy" if its atomic number is greater already than 92. One of the known heavy elements on Earth is Tennessine and Tungsten while in the universe are lithium-5 and berryllium-8.

3 0

3 years ago