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3 years ago

Which of the following is a balanced chemical equation?

Chemistry

2 answers:

Mariana [72]3 years ago

8 0

Answer: The correct answer is Option 4.

Explanation:

Law of conservation of mass states that mass can neither be created nor can be destroyed but it can only be transformed from one form to another form. This law also states that the total number of individual atoms on the reactant side will be equal to the total number of individual atoms on the product side.

Every balanced chemical equation follows law of conservation of mass.

For the given options:

Option 1: $BaCl_2+H_2SO_4\rightarrow BaSO_4+HCl$

Here, number of chlorine and hydrogen atoms on the reactant and product side are not same. Thus, this equation is not balanced.

Option 2: $Cl_2+NaBr\rightarrow NaCl+Br_2$

Here, number of chlorine and bromine atoms on the reactant and product side are not same. Thus, this equation is not balanced.

Option 3: $2H_2+N_2\rightarrow 2NH_3$

Here, number of hydrogen atoms on the reactant and product side are not same. Thus, this equation is not balanced.

Option 4: $2H_2+O_2\rightarrow 2H_2O$

Here, number of hydrogen and oxygen atoms on both the sides are same. Thus, it is a balanced equation.

Hence, the correct answer is Option 4.

Artemon [7]3 years ago

5 0

`2H + 02 -----> 2H2O is a Balanced chemical equation.

WATCH THESE FOR A BETTER UNDERSTANDING :
https://www.youtube.com/watch?v=yA3TZJ2em6g

https://www.youtube.com/watch?v=eNsVaUCzvLA

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One isotope of a metallic element has the mass number 67 and 37 neutrons in the nucleus. The cation derived from the isotope has

Anuta_ua [19.1K]

No. Of protons = mass no. - no. Of neutrons
No. Of protons = 67 - 37
= 30
No. Of electrons = 28

Zinc will have 30 protons and 28 electrons. So, it will have +2 charge

Symbol - Zn^+2

6 0

3 years ago

Read 2 more answers

Convert 15.2 moles of K to atoms of K.

choli [55]

Answer:

$\boxed {\boxed {\sf 9.15*10^{24} \ atoms \ K}}$

Explanation:

To convert atoms to moles, Avogadro's Number must be used: 6.022*10²³.

This tells us the amount of particles (atoms, molecules, etc.) in 1 mole of a substance. In this case it is the atoms of potassium. We can create a ratio.

$\frac {6.022*10^{23} \ atoms \ K }{ 1 \ mol \ K }$

Multiply by the given number of moles: 15.2

$15.2 \ mol \ K *\frac {6.022*10^{23} \ atoms \ K }{ 1 \ mol \ K }$

The moles of potassium cancel.

$15.2 *\frac {6.022*10^{23} \ atoms \ K }{ 1 }$

The denominator of 1 can be ignored.

$15.2 * {6.022*10^{23} \ atoms \ K }{$

Multiply.

$9.15344*10^{24} \ atoms \ K$

The original measurement of moles has 3 significant figures, so our answer must have the same. For the number we calculated that is the hundredth place. The 3 in the thousandth place tells us to leave 5.

$9.15*10^{24} \ atoms \ K$