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3 years ago

Pleasssseeeeee hellllpppppp

Chemistry

1 answer:

prisoha [69]3 years ago

8 0

C is the correct answer

good luck

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46) How many inches are in 25.8 cm?

AfilCa [17]

Answer:

10.15748 so it is none of the above

Explanation:

I just know

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3 years ago

Where are alkaline earth metals found on the periodic table

Virty [35]

The alkaline earth metals are in group two on the periodic table. They have 2 valence electrons.

4 0

4 years ago

When 70.4 g of benzamide (C,H,NO) are dissolved in 850. g of a certain mystery liquid X, the freezing point of the solution is 2

Reil [10]

Answer:

1.60 is the van't Hoff factor for ammonium chloride in X.

Explanation:

$\Delta T_f=iK_f\times m$

$Delta T_f=K_f\times \frac{\text{Mass of solute}}{\text{Molar mass of solute}\times \text{Mass of solvent in Kg}}$ ...(1)

where,

$\Delta T_f$ =Elevation in boiling point =

i = van't Hoff factor

$K_f$ = Freezing point constant

m = molality

1) When 70.4 g of benzamide are dissolved in 850. g of a certain mystery liquid X.

Mass of benzamide = 70.4 g

Molar mass of benzamide = 121 g/mol

i = 1 (organic molecule)

Mass of liquid X = 850 g = 0.850 kg

$K_f$ = Freezing point constant of liquid X= ?

$\Delta T_f=2.7^oC$

Putting all value in a (1):

$2.7^oC=K_f\times \frac{70.4 g}{121 g/mol\times 0.850 kg}$

$K_f=3.944 ^oC kg/mol$

2) When 70.4 g of ammonium chloride are dissolved in 850. g of a certain mystery liquid X.

Mass of ammonium chloride= 70.4 g

Molar mass of ammonium chloride = 53.5 g/mol

i = ? (ionic molecule)

Mass of liquid X = 850 g = 0.850 kg

$K_f=3.944 ^oC kg/mol$

$\Delta T_f=9.9^oC$

Putting all value in a (1):

$9.9^oC=i\times 3.944^oC kg/mol\times \frac{70.4 g}{53.5 g/mol\times 0.850 kg}$

i = 1.6011 ≈ 1.60

1.60 is the van't Hoff factor for ammonium chloride in X.

4 0

3 years ago

A scientist is investigating the structure of aluminum nitrate, which has the chemical formula Al(NO3)3. Based on the chemical f

bekas [8.4K]

The chemical formula of aluminium nitrate is - Al(NO₃)₃
cation is Al³⁺
anion is NO₃⁻
One Al atom binds to three nitrate groups
the options given are
2. It has three aluminum (Al) atoms
this is incorrect as there's only one Al atom
3. It has one NO3 group.
this is incorrect as there are three nitrate groups
4. It has nine nitrogen (N) atoms
there are only 3 N atoms therefore this too is incorrect
therefore the correct answer is -
It has three NO₃ groups

6 0

4 years ago

Which quantity of O2 contains exactly 3.01 × 1023 molecules? a)0.500 mol b)0.250 mol c)16.0 mol d)32.0 mol

sdas [7]

I would think it would be b

5 0

4 years ago