3 The chemical formula NHCl indicates that the formula contains -
A 1 nitrogen atom, 1 hydrogen atom, and 1 chlorine atom

B 1 nitrogen atom, 4 hydrogen atoms, and 4 chlorine atoms

Ci nitrogen atom, 4 hydrogen atoms, and 1 chlorine atom

D 4 nitrogen atoms, 4 hydrogen atoms, and 1 chlorine atom

The formula contains : C. 1 nitrogen atom, 4 hydrogen atoms, and 1 chlorine atom

Given

NH₄Cl compound

Required

The number of atoms

Solution

The empirical formula is the smallest comparison of atoms of compound forming elements.  

A molecular formula is a formula that shows the number of atomic elements that make up a compound.

A molecular formula is composed of two or more elements formed of the same or different types.

A subscript indicating the number of atoms forming a molecule

So for NH₄Cl , there are 3 different elements, N, H and Cl, and the number is shown from the subscript

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