What is the mass in grams of KBr in 0.400 L of a 0.350 M solution???

Response:

0.125 moles

Explanation:

According to Avogadro's principle, one mole of any substance contains 6.02x10^23 atoms.

This implies that 1 mole of chromium consists of 6.02x10^23 atoms.

Therefore, if 1 mole of chromium corresponds to 6.02x10^23 atoms,

Then X moles of chromium are equivalent to 7.52x10^22 atoms, thus

X moles of chromium = 7.52x10^22/6.02x10^23

Thus, X moles of chromium = 0.125 moles

Consequently, 0.125 moles of chromium contain 7.52x10^22 atoms

Answer:

A, B, and C

Explanation:

Indeed, atoms possess mass and serve as the fundamental building blocks of chemical elements. While matter is composed of atoms, these particles themselves do not occupy physical space.

Atoms consist mostly of void, which excludes them from the other responses.

This confirms that A, B, and C are the right choices.

Answer:

The heat capacity of the calorimeter is = 54.4

Explanation:

Given the data

Heat supplied Q = 4.168 KJ = 4168 J

Mass of water = 75.40 gm

Change in temperature = ΔT = 35.82 - 24.58 = 11.24 °C

From the conditions provided

Q = ΔT + ΔT

Plugging all values into the above equation yields

4168 = 75.70 × 4.18 × 11.24 +   × 11.24

611.37 =   × 11.24

= 54.4

This represents the heat capacity of the calorimeter.

Answer:

vHe / vNe = 2.24

Explanation:

To determine the velocity of an ideal gas, one should apply the formula:

v = √3RT / √M

In this equation, R represents the gas constant (8.314 kgm²/s²molK); T refers to temperature, and M indicates the molar mass of the gas (4x10⁻³kg/mol for helium and 20.18x10⁻³ kg/mol for neon). Hence:

vHe = √3×8.314 kgm²/s²molK×T / √4x10⁻³kg/mol

vNe = √3×8.314 kgm²/s²molK×T / √20.18x10⁻³kg/mol

The ratio simplifies to:

vHe / vNe = √3×8.314 kgm²/s²molK×T / √4x10⁻³kg/mol / √3×8.314 kgm²/s²molK×T / √20.18x10⁻³kg/mol

vHe / vNe = √20.18x10⁻³kg/mol / √4x10⁻³kg/mol

vHe / vNe = 2.24

I hope it assists you!