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2 years ago

I need help with this, please I need it ASAP

Chemistry

2 answers:

gizmo_the_mogwai [7]2 years ago

7 0

I’m pretty sure it’s B

AnnyKZ [126]2 years ago

3 0

I think it might be letter b. hope this helped have a wonderful day!!

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How many milliliters of 2.19 M H2SO4 are required to react with 4.75 g of solid containing 21.6 wt% Ba(NO3)2 if the reaction is

Setler [38]

Answer:

1.7927 mL

Explanation:

The mass of solid taken = 4.75 g

This solid contains 21.6 wt% $Ba(NO_3)_2$ , thus,

Mass of $Ba(NO_3)_2$ = $\frac {21.6}{100}\times 4.75\ g$ = 1.026 g

Molar mass of $Ba(NO_3)_2$ = 261.337 g/mol

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$Moles= \frac{1.026\ g}{261.337\ g/mol}$

$Moles= 0.003926\ mol$

Considering the reaction as:

$Ba(NO_3)_2+H_2SO_4\rightarrow BaSO_4+2HNO_3$

1 moles of $Ba(NO_3)_2$ react with 1 mole of $H_2SO_4$

Thus,

0.003926 mole of $Ba(NO_3)_2$ react with 0.003926 mole of $H_2SO_4$

Moles of $H_2SO_4$ = 0.003926 mole

Also, considering:

$Molarity=\frac{Moles\ of\ solute}{Volume\ of\ the\ solution}$

Molarity = 2.19 M

So,

$2.19=\frac{0.003926}{Volume\ of\ the\ solution(L)}$

Volume = 0.0017927 L

Also, 1 L = 1000 mL

So, volume = 1.7927 mL

5 0

2 years ago

Why do different elements make different color flames when you burn them?

Dovator [93]

When you heat an atom, some of its electrons are "excited* to higher energy levels. When an electron drops from one level to a lower energy level, it emits a quantum of energy. ... The different mix of energy differences for each atom produces different colours. Each metal gives a characteristic flame emission spectrum.

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2 years ago

What is the gulf stream. a surface current a deep current a river a climate event

guapka [62]

I think it’s a climate event

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2 years ago

How many grams of ethylene glycol (c2h6o2) must be added to 1.00 kg of water to produce a solution that freezes at -5.00oc? (kf

leonid [27]

Answer: 167 g

Explanation:

1) The depression of the freezing point of a solution is a colligative property ruled by this equation:

ΔTf = i × m × Kf

Where:

ΔTf is the decrease of the freezing point of the solvent due to the presence of the solute.

i is the Van't Hoof factor and is equal to the number of ions per each mole of solute. It is only valid for ionic compounds. Here the solute is not ionice, so you take i = 1

Kf is the molal freezing constant and is different for each solvent. For water it is 1.86 m/°C

2) Calculate the molality (m) of the solution

ΔTf = i × m × Kf ⇒ m = ΔTf / ( i × Kf) = 5.00°C / 1.86°C/m = 2.69 m

3) Calculate the number of moles from the molality definition

m = moles of solute / kg of solvent ⇒ moles of solute = m × kg of solvent

moles of solute = 2.69 m × 1.00 kg = 2.69 moles

4) Convert moles to grams using the molar mass

molar mass of C₂H₆O₂ = 62.07 g/mol

mass in grams = number of moles × molar mass = 2.69 moles × 62.07 g/mol = 166.97 g ≈ 167 g

6 0

2 years ago

What is the electric force on a proton 2.5 fmfm from the surface of the nucleus? Hint: Treat the spherical nucleus as a point ch

sammy [17]

Explanation:

It is known that charge on xenon nucleus is $q_{1}$ equal to +54e. And, charge on the proton is $q_{2}$ equal to +e. So, radius of the nucleus is as follows.