Find the number of moles of argon in 534 g
of Argon

13.4 mol Ar

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

534 g Ar

Step 2: Identify Conversions

Molar Mass of Ar - 39.95 g/mol

Step 3: Convert

= 13.3667 mol Ar

Step 4: Check

We are given 3 sig figs. Follow sig fig rules and round.

13.3667 mol Ar ≈ 13.4 mol Ar

how to make a simple air condition

first let us lay out the formula for potential

and kinetic energy:

pe = mgh

ke = (mv^2)/2

where: m=mass, v=velocity, g=gravitational

acceleration, h=height

calculating for mass using the known values of

pe:

340j = m (9.81 m/s^2) (50ft) (1m/3.28ft)

m = 2.27 kg

the law of conservation of energy states that

energy is neither created nor destroyed. therefore, the change in kinetic

energy from 50 ft to 35 ft would be equal to the change in potential energy

from 50 ft to 35 ft. however it would be opposite in signs since one is losing

while other is gaining.

ke(35ft) – ke(50ft) = - [ pe(35ft) – pe(50ft]

ke(50ft) = 0 since the brick is initially at rest

ke(35ft) = 340j - 2.27kg (9.81 m/s^2) (35ft)

(1m/3.28 ft)

ke(35ft)

= 102.38 j