All categories

3 years ago

In a chemical equation, the sum of the masses ______.

Chemistry

2 answers:

Readme [11.4K]3 years ago

5 0

C. Of the products is equal to the reactants.

Good luck out there! :)

fiasKO [112]3 years ago

3 0

Answer: of the products is equal to the reactants

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The balanced chemical equation for formation of water :

$2H_2+O_2\rightarrow 2H_2O$

mass of reactants = mass of hydrogen + mass of oxygen = $2mol\times 2g/mol+1\times 32g/mol=36g$

mass of product = mass of water = $2mol\times 18g/mol=36g$

You might be interested in

Which element probably reacts most like bromine, Br?

Nikitich [7]

D) Chlorine, Cl. Hope that helped

8 0

3 years ago

Read 2 more answers

The lone pair of electrons in ammonia allows the molecule to: A.assume a planar structure. B.act as an oxidizing agent. C.act as

serious [3.7K]

Answer:

The correct option is: D.act as a Lewis base in water.

Explanation:

Ammonia is a hydride of nitrogen with the chemical formula NH₃. It is a colorless gas with a characteristic pungent smell. According to the VSEPR theory, it has a trigonal pyramidal structure.

In water, ammonia acts as a Lewis base due to the presence of lone pair on the nitrogen atom. Lewis bases are electron pair or lone pair donors.

8 0

3 years ago

The Center of the Adam is called

Setler [38]

Answer:

The center of an Atom is called the Nucleus.

Explanation:

3 0

3 years ago

Read 2 more answers

Please help and show work, i will mark you brainlest

Natali [406]

Answer:

7x-2(3-4)-2

Pls help

Explanation:

8 0

3 years ago

How many moles of oxygen atoms are present in 30.5 grams of hydrogen peroxide (h2o2)?

Pepsi [2]

1.8 moles of oxygen atoms are present in 30.5 grams of hydrogen peroxide.

<u>Explanation:</u>

First we have to convert the given weight of hydrogen peroxide to molar mass of hydrogen peroxide. So for this, we have to divide the given weight with the molecular mass of hydrogen peroxide.

$\text {Molecular mass of } \mathrm{H}_{2} \mathrm{O}_{2}=(2 \times 1)+(2 \times 16)=2+32=34 \mathrm{g}$

So,

$\text {Molar mass of } \mathrm{H}_{2} \mathrm{O}_{2}=\frac{30.5}{34}=0.90 \text { moles of } \mathrm{H}_{2} \mathrm{O}_{2}$

Second step, in this moles, 2 molecules of oxygen are present. Thus 1 mole of Hydrogen peroxide consists of 2 moles of oxygen. Then,

$0.90 moles of $\mathrm{H}_{2} \mathrm{O}_{2}=2 \times 0.90=1.8$ moles of oxygen$

So, 30.5 grams of hydrogen peroxide consists of 1.8 moles of oxygen.

4 0

3 years ago