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3 years ago

What mass of magnesium hydroxide is required to create a 441 mL solution with a pH of 12.52?

Chemistry

1 answer:

marshall27 [118]3 years ago

4 0

Answer:

0.423g

Explanation:

akording to mass = concetration x volume

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How many moles are in 110 grams of nahco3

yuradex [85]

Molar mass NaHCO₃ = 23 + 1 + 12 + 16 x 3 = 84 g/mol

1 mole ---------- 84 g
? mole ---------- 110 g

moles NaHCO₃ = 110 . 1 / 84

moles NaHCO₃ = 110 / 84

= 1.309 moles

hope this helps!

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3 years ago

An unknown gaseous substance has a density of 1.06 g/L at 31 °C and 371 torr. If the substance has the following percent composi

Anarel [89]

Answer:

C) C4H6 - Right answer

Explanation:

Let's combine the Ideal Gases Law with density to get the molecular formula for the unknown gas.

Density = mass / volume

1.06 g /L means that 1.06 grams of compound occupy 1 liter of volume.

P . V = n . R . T

Pressure in Torr must be converted to atm

760 Torr are 1 atm

371 Torr are __ (371 .1)/760 = 0.488 atm

0.488 atm . 1L = 1.06g/MM . 0.082 . 304K

(0.488 atm . 1L) / 0.082 . 304K = 1.06g/ MM

Mass / Molar mass = Moles → That's why the 1.06 g / MM

0.0195 mol = 1.06g / MM

1.06g/0.0195 mol = MM → 54.3 g/m

Now, let's use the composition

100 g of compound have 88.8 g of C

54.3 g of compound have ___ (54.3 . 88.8) /100 = 48 g of C

100 g of compound have 11.2 g of H

54.3 g of compound have __ (54.3 . 11.2)/100 = 6 g of H

48 g of C are included un 4 atoms

6 g of H are included in 6 atoms

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3 years ago

Which of the following is not a correct formula? A)Ba2O B)Ca3N2 C)KCl D)Li2S

love history [14]

Answer:- A. $Ba_2O$ is not the correct formula.

Explanations:- Charge for Ba is +2 and charge for O is -2, Here the charges are in equal and opposite so their ratio is 1:1 and hence the formula must be BaO and not $Ba_2O$ .

Rest of the formulas are correct as charge for Ca is +2 and charge for N is -3 . On criss cross we get the formula $Ca_3N_2$ .

Charge for K is +1 and charge for Cl is -1 and so KCl is correct.

Charge for Li is +1 and that for S is -2. On criss cross we get the formula $Li_2S$ .

7 0

2 years ago

Hurry please help I really need it

faust18 [17]

Answer:

CO2 & H2O

Explanation:

Anything on the right

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2 years ago

A student shines a flashlight on the lens. Which best describes what happens when light rays exit the lens?

zhannawk [14.2K]

The flashlight's beam will all be refracted towards a central axis. But, this is still dependent on the type of lens that is used for the said activity. The speed of light will vary depending whether the lens is a concave or a convex lens. The exit point of the light will always head towards the central axis.

7 0

3 years ago

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What mass of magnesium hydroxide is required to create a 441 mL solution with a pH of 12.52￼?

What mass of magnesium hydroxide is required to create a 441 mL solution with a pH of 12.52?