Ask question

Ask question

All categories

4 years ago

11

Iron is the most

1 answer:

Georgia [21]4 years ago

5 0

hope this is correct

Answer:

D

Explanation:

Iron is the fourth most abundant element, by mass, in the Earth's crust. The core of the Earth is thought to be largely composed of iron with nickel and sulfur. The most common iron-containing ore is haematite, but iron is found widely distributed in other minerals such as magnetite and taconite.

You might be interested in

How many mmoles are in 8.34 mol ?

borishaifa [10]

Answer:

8.34 moles

Explanation:

We are given 8.34 moles.

We need to find moles: 8.34

4 0

4 years ago

Number is equal to 6022 x 10^23

Juliette [100K]

Answer:

The Avogadro's number

Explanation:

the number is 6.02214x10 to the 23 power

8 0

3 years ago

What syndrome did you researched

igor_vitrenko [27]

Need more information.

3 0

3 years ago

Green plants absorb sunlight to power photosynthesis, the chemical synthesis of food from water and carbon dioxide. The compound

tekilochka [14]

Answer: The frequency of this light is $6.74\times 10^{17}Hz$ .

Explanation:-

To calculate the frequency of light, we use the equation:

$\lambda=\frac{c}{\nu}$

where,

$\lambda$ = wavelength of the light = $430nm=430\times 10^{-9}m$ $1nm=10^{-9}m$

c = speed of light = $2.9\times 10^8m/s$

$\nu$ = frequency of light = ?

$\nu=\frac{c}{\lambda}$

$\nu=\frac{2.9\times 10^8m/s}{430\times 10^{-9}m}$

$\nu=\frac{2.9\times 10^8m/s}{430\times 10^{-9}m}=6.74\times 10^{17}s^{-1}=6.74\times 10^{17}Hz$

The frequency of this light is $6.74\times 10^{17}Hz$ .

4 0

4 years ago

A mixture of helium and nitrogen gases, in a 7.03 L flask at 17 °C, contains 0.738 grams of helium and 8.98 grams of nitrogen. T

Andrei [34K]

Answer:

The partial pressure of nitrogen in the flask is 1.08 atm and the total pressure in the flask is 1.70 atm.

Explanation:

We must use the Ideal Gas Law to solve this:

Pressure . volume = n . R . T

T = T° in K → T°C + 273

17°C + 273 = 290K

n = moles

In a mixture, n is the total moles (Sum of each mol, from each gas)

Moles = Mass / Molar mass

Moles He = 0.738 g / 4g/m = 0.184 moles

Moles N₂ = 8.98 g / 28g/m = 0.320 moles

0.184 m + 0.320m = 0.504 moles

P . 7.03L = 0.504m . 0.082L.atm/ mol.K . 290K

P = (0.504m . 0.082L.atm/ mol.K . 290K) /7.03L

P = 1.70 atm - This is the total pressure.

To know the partial pressure of N₂ we can apply, the molar fraction:

Moles of N₂ / Total moles = Pressure N₂ / Total pressure

0.320m / 0.504m = Pressure N₂ / 1.70atm

(0.320m / 0.504m) . 1.70atm = Pressure N₂

1.08atm = Pressure N₂

8 0

4 years ago