How many atoms are in 6.3 moles of calcium

Answers

Answer 1

Answer: 1 mol --------- 6.02x10²³ atoms
6.3 moles ---- ??

atoms = 6.3 * 6.02x10²³

= 3.7926x10²⁴ atoms

hope this helps!

Answer 2

Answer:

Final answer:

In 6.3 moles of calcium, there are approximately 3.79 x 10²⁴ atoms. This is calculated using Avogadro's number (6.022 x 10²³), which provides the number of atoms in a mole.

Explanation:

To find the number of atoms in 6.3 moles of calcium, you need to use Avogadro's number, which is 6.022 x 10²³. This number, known as Avogadro's constant, is the number of atoms or molecules in one mole of any substance. Therefore, you would calculate the number of atoms as follows:

6.3 moles of calcium × (6.022 x 10²³ atoms/mole) = 3.79 x 10²⁴ calcium atoms.

So, 6.3 moles of calcium have approximately 3.79 x 10²⁴ calcium atoms.

Learn more about Moles and Atoms here:

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Determine the pressure change when a constant volume of gas at 2.50 atm is heated from 30.0 °C to 40.0 °C.

Answers

Answer:

The pressure changes from 2.50 atm to 2.58 atm (an increase of approximately 0.08 atm) when the gas is heated from 30.0°C to 40.0°C.

Explanation:

As the given volume of gas is constant, we can use Gay-Lussac's law to solve this problem as it relates pressure to temperature.

Gay-Lussac's law

$\boxed{\sf (P_1)/(T_1)=(P_2)/(T_2)}$

where:

P₁ = Initial pressure
T₁ = Initial temperature (in kelvins)
P₂ = Final pressure
T₂ = Final temperature (in kelvins)

First, we need to convert the given temperatures from Celsius to Kelvin by adding 273.15:

$\implies \sf T_1=30+273.15=303.15\;K$

$\implies \sf T_2=40+273.15=313.15\;K$

Therefore, the values to substitute into the equation are:

P₁ = 2.50 atm
T₁ = 303.15 K
T₂ = 313.15 K

As we are solving for the final pressure, rearrange the equation to isolate P₂:

$\sf P_2=(P_1T_2)/(T_1)$

Substitute the values into the equation and solve forP₂:

$\implies \sf P_2=(2.50 \cdot 313.15)/(303.15)$

$\implies \sf P_2=(782.875)/(303.15)$

$\implies \sf P_2=2.58246742...$

$\implies \sf P_2=2.58\;atm\;(3\;s.f.)$

Therefore, the pressure changes from 2.50 atm to 2.58 atm (an increase of approximately 0.08 atm) when the gas is heated from 30.0°C to 40.0°C.

What is the nitrogen cycle?

Answers

Nitrogen cycle is the series of processess where nitrogen and its compound move through the environment and in living organisms. The processes here include fixation, ammonification, nitrification and denitrification. Majority of Earth's atmosphere is nitrogen.

How does oxygen get into the cell in order for cellular respiration to occur?A.Diffusion
B.Exocytosis
C.Osmosis
D.Endocytosis

Answers

Answer:

A. Diffusion

Explanation:

A.Diffusion - this is correct. Diffusion is the process where small molecules enter the cell by moving from a high concentration to a low concentration through a semi-permeable membrane.

B.Exocytosis - this is incorrect. Exocytosis is a cell transport mechanism where the cell uses a system of vesicles to transport cargo outside of the cell. The vesicles fuse to the cell membrane and deliver the cargo outside.

C.Osmosis - this is incorrect, osmosis is a type of diffusion specific to water molecules

D.Endocytosis - this is incorrect. Endoocytosis is a cell transport mechanism where the cell uses a system of vesicles to transport cargo into the cell. The cell membrane engulfs the molecules and brings them into the cell via the vesicle

A bond exists between A and B in the compound AB. A and B are sharing electrons. The type of bond is ____

Answers

Answer: Covalent

Explanation:

A covalent bond is formed when an element shares its valence electron with another element. This bond is formed between two non metals. Example: $H_2$

An ionic bond is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element and the element which accepts the electrons is known as electronegative element. This bond is formed between a metal and an non-metal. Example: $NaCl$