Question

In which chemical equation is the number of atoms in the reactants the same as the number of atoms in the products?

A:Zn + 2HCl → Hv2 + ZnClv2
B:CHv4 + Ov2 → COv2 + 2Hv2O
C:Liv2COv3 → LiO + COv2
D:COv2 + Hv2O → CHv2OH + Ov2
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Which statement is true regarding a chemical reaction?

A:Even if the total number of atoms does not change, mass may not be conserved in the reaction.
B:The total number of atoms changes, so mass is conserved in the reaction.
C:The total number of atoms does not change, so mass is conserved in the reaction.
D:Even if the total number of atoms changes, mass may not be conserved in the reaction.
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Use the equation and the table to answer the question.

FeClv3 + 3Hv2O → Fe(OH)v3 + 3HCl

Element Mass of an Atom (amu)
Fe 56
Cl 35
H 1
O 16
Iron chloride and water react according to the equation shown. The table shows the atomic masses of the elements involved in the reaction. What is the total mass of the reactants?

A:215 amu
B:179 amu
C:161 amu
D:108 amu
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In a chemical reaction, two molecules with a total mass of 76 amu react to form a single molecule. What is the mass of the molecule that is formed?

A:152 amu
B:76 amu
C:38 amu
D:228 amu

Answer 1

Don't you have some idea how to solve these. Tell me what your problem is WITH EACH and I'll help you through. But know that "I don't have a clue" will not suffice.

Answer 2

They just needed some help, calm down.

Answer 3

[AI-generated answer — Explain Bot]

To determine which chemical equation has the same number of atoms in the reactants as in the products, you need to count the number of atoms on each side of the equation. Let's go through each option:

A: Zn + 2HCl → H2 + ZnCl2
Reactants: 1 zinc atom, 2 hydrogen atoms, and 2 chlorine atoms.
Products: 2 hydrogen atoms and 1 zinc atom.

B: CH4 + O2 → CO2 + 2H2O
Reactants: 1 carbon atom and 4 hydrogen atoms.
Products: 1 carbon atom, 2 oxygen atoms, and 4 hydrogen atoms.

C: Li2CO3 → Li2O + CO2
Reactants: 2 lithium atoms, 1 carbon atom, and 3 oxygen atoms.
Products: 2 lithium atoms, 1 oxygen atom, and 2 carbon atoms.

D: CO2 + 2H2O → CH2OH + O2
Reactants: 1 carbon atom and 2 oxygen atoms.
Products: 1 carbon atom, 4 hydrogen atoms, and 2 oxygen atoms.

By comparing the reactants and products for each equation, we can see that Option C: Li2CO3 → Li2O + CO2 has the same number of atoms on both sides of the equation.

Regarding the second question, a true statement about a chemical reaction is:

C: The total number of atoms does not change, so mass is conserved in the reaction.

Now, let's calculate the total mass of the reactants in the equation FeCl3 + 3H2O → Fe(OH)3 + 3HCl, using the atomic masses from the provided table:

FeCl3: (Fe: 56 amu) + (Cl: 35 amu * 3) = 161 amu
H2O: (H: 1 amu * 2) + (O: 16 amu) = 18 amu * 3 = 54 amu

Total mass of the reactants = 161 amu + 54 amu = 215 amu

Therefore, the total mass of the reactants is 215 amu, and the correct option is A: 215 amu.

In the last question, it is stated that two molecules with a total mass of 76 amu react to form a single molecule. Since we are given the total mass of the reactants, we can conclude that the mass of the resulting molecule is also 76 amu.

Therefore, the correct option is B: 76 amu.