C. 49.8 grams of ki is dissolved in enough water to make 1.00 l of solution. what is the molarity?

49.8 grams of KI is dissolved in 1 L of solution have a molarity = 0.3M

Explanation:

We need the molar mass of KI, we can find the molar mass with the atomic weight of potassium and iodo. We can find this information using the periodic table of the elements.

Atomic weight of

Atomic weight of

Adding the atomic weights of potassium and iodo, we can obtain the molar mass of KI:

To find the molarity we need the moles of KI in 49.8 g of KI

The molarity formula is:

Where:

n= moles of KI

V= volume

The molarity is 0.3 M

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