Copper(ii) sulfide, cus, is used in the development of aniline black dye in textile printing. what is the maximum mass of cus which can be formed when 38.0 ml of 0.500 m cucl2 are mixed with 42.0 ml of 0.600 m (nh4)2s

Explanation:

The chemical reaction equation will be as follows.

As 1 mole reacts with 1 mole of

Hence, moles of = Molarity × Volume (in mL)

                                              = 0.5 × 38.0 mL

                                              = 0.019 mol

Moles of = Molarity × Volume (in mL)

                                           = 0.6 × 42.0 mL

                                           = 0.0252 mol

As moles of CuS is less than the moles of . This means that CuS is the limiting reagent.

Thus, maximum moles of CuS formed are 0.019 mol. As molar mass of CuS is 95.6 g/mol.

Therefore, maximum mass of CuS can be formed is

                    = 1.8164 g

Thus, we can conclude that maximum mass of CuS formed is 1.8164 g.

the answer is the

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