How many oxygen atoms are in 7.90 g of Al2(SO4)3?

Chemical Equations :p

Nata [24]

Explanation:

4NH₃ (g) + 5O₂ (g) → 4NO (g) + 6H₂O (g)
Ba(ClO₃)₂ (s) → BaCl₂ (s) + 3O₂ (g)
2Al (s) + 3Zn(NO₃)₂ (aq.) → 3Zn (s) + 2Al(NO₃)₃ (aq.)
2C₈H₁₈ (g) + 25O₂ (g) → 16CO₂ (g) + 18H₂O (g)

6 0

3 years ago

A solution contains 72.0 g of HCI and 468 g of (C6H6). what is the mole fraction of benzene

erica [24]

Molar mass (MM) of benzene C6H6
C = 6 * 12 = 72u
H = 6 * 1 = 6u
MM C6H6 = 72 + 6 = 78 g / mol
Benzene - Molar Mass = 78 g --------- 1 mol
Of A Mix has 468 g -------------- x

78x = 468
X = 468/78
X = 6 moles

Molar mass (MM) of Hydrochloric Acid HCl H = 1 * 1 = 1u
CI = 1 * 35 = 35u
MM HCl = 1 + 35 = 36 g / mol

Hydrochloric Acid - Molar Mass = 36 g ---------- 1 mol
Of A Mix has 72 g ------------ y

36y = 72
Y = 72/36
Y = 2 moles

Thus, a mixture has a total of 8 moles (6 mol + 2 mol).
Dividing One Mole Amount of Each Substance by the Number of Total Mole Amounts, Then we will obtain a Molar Fraction of Each:
Molar fraction make benzene = (6/8) simplify 2 = 3/4
Molar Fraction to make Hydrochloric Acid = (2/8) = simplify 2 = 1/4

Note:. The sum of the molar fractions of the always give goes 1, we have: 3/4 + 1/4 = 1

ANSWER:
 $\boxed{\frac{3}{4}}$

4 0

3 years ago

What are 2 reasons molecules cannot pass easily through the cell membrane? What part of the cell membrane helps them get through

tatuchka [14]

Answer:

The cell membrane's main trait is its selective permeability, which means that it allows some substances to cross it easily, but not others. Small molecules that are nonpolar (have no charge) can cross the membrane easily through diffusion, but ions (charged molecules) and larger molecules typically cannot. A concentration gradient is a just a region of space over which the concentration of a substance changes, and substances will naturally move down their gradients, from an area of higher to an area of lower concentration.

In cells, some molecules can move down their concentration gradients by crossing the lipid portion of the membrane directly, while others must pass through membrane proteins in a process called facilitated diffusion.

Explanation:

there are your two reasons molecules cannot pass easily through the cell membrane and what part of the cell membrane helps them get through is concentration gradient

3 0

3 years ago

In the periodic table below, shade all the elements for which the neutral atom has a valence electron configuration of ns2np3 ,

Lorico [155]

Answer is: chemical elements in group 15 of the periodic table have neutral atom with a valence electron configuration of ns²np³.
Nitrogen: [He] 2s² 2p³.
Phosphorus: [Ne] 3s² 3p³.
Arsenic: [Ar] 3d¹⁰ 4s² 4p³.
Bismuth: [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p³.
Moscovium: predicted [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p³.
These elements have 5 valence electrons.

5 0

4 years ago

Answer this question fast please!

MrRissso [65]

Answer:

A is a physical change, no atoms are being lost its still in it original form

B is a chemical change, it is losing atoms and changing into a new substance

Explanation:

5 0

3 years ago