Find the number of atoms of each element in 180g na2so4

Explanation:

There really are no atoms. Some are ions. However at your level, I think you are expected to answer something connected to 6.02 * 10^23

First Find the mass of one mole

Na: 2 * 23 = 46

S:    1 * 32 = 32

O:   4* 16  = 64

Total          142

Next Find the number of Moles

1 mole has a mass of 142

x mole have a mass of 180

Cross Multiply

142 * x = 180  * 1

x = 180 / 142

x = 1. 27 moles.

Next figure out the number of atoms in 1.27 moles of Na2SO4

Na: 2 * 1.27 * 6.02 * 10^23 = 1.53 * 10^24

S : 1  * 1.27 * 6.02 * 10^23 =  7.6 * 10^23

O: 4 * 1.27 * 6.02 * 10^23  =3.05 * 10^24

Total                                      5.34*10^24

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

im not exactly sure but i think its b!