An element has an atomic number of 30. How many protons and electrons are in a neutral atom of the element?A. 30 protons, 30 electrons
B. 15 protons, 15 electrons
C. 60 protons, 30 electrons
D. 30 protons, 0 electrons

Answer:

23.0733 L

Explanation:

The mass of hydrogen peroxide present in 125 g of 50% of hydrogen peroxide solution:

Mass = 62.5 g

Molar mass of = 34 g/mol

The formula for the calculation of moles is shown below:

Thus, moles are:

Consider the given reaction as:

2 moles of hydrogen peroxide decomposes to give 1 mole of oxygen gas.

Also,

1 mole of hydrogen peroxide decomposes to give 1/2 mole of oxygen gas.

So,

1.8382 moles of hydrogen peroxide decomposes to give

So,

Pressure = 746 / 760 atm = 0.9816 atm

Temperature = 27 °C

The conversion of T( °C) to T(K) is shown below:

T(K) = T( °C) + 273.15  

So,  

T₁ = (27 + 273.15) K = 300.15 K

Using ideal gas equation as:

PV=nRT

where,  

P is the pressure

V is the volume

n is the number of moles

T is the temperature  

R is Gas constant having value = 0.0821 L.atm/K.mol

Applying the equation as:

0.9816 atm × V = 0.9191 mol × 0.0821 L.atm/K.mol × 300.15 K

⇒V = 23.0733 L

Final answer:

Chemistry is the study of the properties, composition, and structure of substances, and the transformations they undergo. It also deals with the energy exchanges in these processes. As "The Central Science", chemistry interrelates with numerous other scientific disciplines.

Explanation:

Chemistry, often referred to as "The Central Science", is a branch of science that deals with the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is released or absorbed during these processes. It plays a vital role in multiple disciplines such as biology, medicine and environmental science. It allows us to understand the makeup of substances, from the atomic level to complex molecules, and how they interact through chemical reactions.

One example of a branch of Chemistry is thermochemistry, which focuses on relationships between heat, work, and other types of energy in physical and chemical processes. Dalton's atomic theory, investigating quantitative and qualitative aspects of chemistry, also developed the concept of atomic mass units, allowing for the calculation of formula mass and the quantitative description of substances.

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When 3.0 moles of hydrogen peroxide decompose at 1.0 atm and 23°C, approximately 36.78 liters of oxygen gas are produced according to the ideal gas law.

What volume of oxygen gas is produced at a pressure of 1.0 atm and a temperature of 23 °C?

To find the volume of oxygen gas produced when 3.0 moles of hydrogen peroxide decompose at a pressure of 1.0 atm and a temperature of 23°C, you can use the ideal gas law:

PV = nRT

Where:

- P is the pressure (1.0 atm).

- V is the volume (what we want to find).

- n is the number of moles of gas (1.5 moles of O2 since 1 mole of O2 is produced for every 2 moles of H2O2).

- R is the ideal gas constant (approximately 0.0821 L.atm/mol.K).

- T is the temperature in Kelvin (23°C needs to be converted to Kelvin, which is 296.15 K).

First, calculate the number of moles of O2 produced:

n = 3.0 moles of H2O2 * (1 mole of O2 / 2 moles of H2O2) = 1.5 moles of O2

Now, plug in the values into the ideal gas law and solve for V:

1.0 atm * V = 1.5 moles * 0.0821 L·atm/mol·K * 296.15 K

Now, calculate the volume:

V = (1.5 moles * 0.0821 L·atm/mol·K * 296.15 K) / 1.0 atm

Calculate the volume:

V ≈ 36.78 L

So, the volume of oxygen gas produced when 3.0 moles of hydrogen peroxide decompose at 1.0 atm and 23°C is approximately 36.78 liters.

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Answer:

Energy is absorbed, so the mass is reduced

Explanation:

The relationship between the mass and the energy is given by Einstein formula as : m is the mass of an atom c is the speed of light When an atom is formed, the energy gets absorbed. As a result mass will decrease as per Einstein's equation.

So, the correct option is (c) "Energy is absorbed, so the mass is reduced".