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4 years ago

During a chemical reaction, _ and _ are both conserved.

Chemistry

1 answer:

Alla [95]4 years ago

5 0

The answer is C mass and energy

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A certain compound has the percent composition (by mass) 85.63% C and 14.37% H. The molar mass of the compound is 42.0 g/mol. Ca

AlekseyPX

Answer:

The molecular formula is C3H6

Explanation:

Step 1: Data given

Suppose the compound has a mass of 100 grams

The compound contains:

85.63 % C = 85.63 grams C

14.37 % H = 14.37 grams H

Molar mass C = 12.01 g/mol

Molar mass H = 1.01 g/mol

Step 2: Calculate moles

Moles = grams / molar mass

Moles C = 85.63 grams / 12.01 g/mol

Moles C = 7.130 moles

Moles H = 14.37 grams / 1.01 g/mol

Moles H = 14.2 moles

Step 3: Calculate the mol ratio

We divide by the smallest amount of moles

C: 7.130 moles / 7.130 moles = 1

H = 14.2 moles / 7.130 moles = 2

The empirical formula is CH2

The molar mass of CH2 = 14 g/mol

Step 4: Calculate molecular formula

We have to multiply the empirical formula by n

n = 42 / 14 = 3

n*(CH2) = C3H6

The molecular formula is C3H6

8 0

3 years ago

What is the balanced equation of K3PO4 + HCI -> KCI + H3PO4?

laiz [17]

Answer:

K₃PO₄ + 3HCl ⇒ 3KCl + H₃PO₄

Explanation:

practice these, it gets easier. goal is to match the amount of reactants and products on both sides of the equation. cheers!

5 0

3 years ago

A gas is produced when 25 g of substance X is mixed into 60 g of solution Z in a beaker. The mass of the solution in the beaker

Zepler [3.9K]

mass of the gas = 10 g

<h3>Further explanation</h3>

<em>The law of conservation of mass :</em>

<em>In a closed / isolated system, the total mass of the substance before the reaction will be equal to the total mass of the reaction product.</em>

Reaction

$\tt X+Z\rightarrow gas+solution$

mass before reaction=mass after reaction

$\tt 25+60=gas+75\\\\gas=25+60-75=10~g$

5 0

3 years ago

1. What is solar energy? Give an example

Airida [17]

Answer:

Solar energy is energy from the sun. for example solar panels are used to use energy for the sun to give you eletricity.

Explanation:

8 0

3 years ago

Read 2 more answers

If a neutral atom of beryllium has 4 protons and 5 neutrons, what is the mass number of the atom?

Fynjy0 [20]

Answer:

Explanation:

mass number =protons+neutrons

4 0

4 years ago

During a chemical reaction, _______ and _______ are both conserved.

During a chemical reaction, _ and _ are both conserved.