Help with this too!!!!!

2 NH3 + 3 CuO --> 3 Cu + N2 + 3 H2O

Gnom [1K]

Answer: 0.5 moles of $N_2$ are produced in the reaction

Explanation:

The number of moles is defined as the ratio of the mass of a substance to its molar mass.

The equation used is:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ ......(1)

Given mass of $CuO$ = 113.6 g

Molar mass of $CuO$ = 79.5 g/mol

Plugging values in equation 1:

$\text{Moles of CuO}=\frac{113.6g}{79.5g/mol}=1.43 mol$

For the given chemical reaction:

$2NH_3+3CuO\rightarrow 3Cu+N_2+3H_2O$

By the stoichiometry of the reaction:

If 3 moles of $CuO$ produces 1 mole of $N_2$

So, 1.43 moles of $CuO$ will produce = $\frac{1}{3}\times 1.43=0.476=0.5mol$ of $N_2$

Hence, 0.5 moles of $N_2$ are produced in the reaction

5 0

3 years ago

Explain (not just list) where you observe reflection, refraction, and absorption of light in your everyday activities

DerKrebs [107]

Answer:

Reflection: you look in the mirror. Refraction: You put a straw in a glass of water, and it looks like it broke. Absorption: If you have a black sweater and you wear it out in the cold, the black sweater is going to hold in heat better than a lighter sweater because the black sweater absorbs light .

7 0

3 years ago

Which is the pathway of light as it travels through the eye?cornea → iris → retina → lenscornea → iris → lens → retinairis → cor

Vikki [24]

Answer:

Cornea >iris>lens >retina

Explanation:

Can't exactly figure out the answer but I think it should look like this

7 0

2 years ago

Why is thermal energy from the sun transferred to Earth through electromagnetic waves, instead of any other type of thermal ener

nlexa [21]

Answer: B) Electromagnetic waves can travel through empty space.

Explanation:

Conduction: This type of heat transfer happens when there is direct contact between the two object. Example: heating a pan on stove.

Convection: This type of heat transfer happens when there is a movement of fluid (liquid or gas) due to the movement of hot layers to the top and cold layers to the bottom which leads to convection currents. Example: Heating of swimming pool.

Radiation: This type of heat transfer happens when there is direct transfer of energy through empty space.The electromagnetic radiation from the surface of an object which is due to the object's temperature is radiation. Example: Heating of earth's surface.

4 0

3 years ago

We add a 1.20-g sample of dry ice to a 755-mL flask containing nitrogen gas at a temperature of 25.0 C and a pressure of 725mmHg

yaroslaw [1]

Answer:

Total pressure is 1396 mmHg

Explanation:

By:

PV/RT = n

It is possible to obtain the initial moles of nitrogen gas, where:

P is pressure (725 mmHg = 0,954 atm)

V is volume (0,755L)

R is gas constant (0,082atmL/molK)

T is temperature (25,0°C = 298,15 K)

Replacing:

n = 0,02946 moles of nitrogen gas.

The moles of dry ice (CO₂; molar mass= 44,01 g/mol) are:

1,20 g × (1mol/44,01g) = 0,02727 moles of dry ice.

When dry ice sublimes, total moles are:

0,02727 + 0,02946 = 0,05673 moles

With the temperature (25,0°C = 298,15 K) and volume (0,755L) it is possible to obtain total pressure, thus:

P = nRT/V

Replacing:

P = 1,837 atm × (760 mmHg/1atm) = 1396 mmHg

I hope it helps!

3 0

3 years ago