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Eddi Din [679]
2 years ago
14

OMG PLEASE HELP!! THIS IS IMPORTANT!!

Chemistry
2 answers:
sergey [27]2 years ago
6 0

Answer:

options D is correct

....hope it helps you

bogdanovich [222]2 years ago
5 0

Answer:

The cell membrane is protective layer surrounding a cell.

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Given that the molar mass of NaCl is 58.44 g/mol, what is the molarity of a solution that contains 87.75 g of NaCl in 500. mL of
Stells [14]

<u>Given information:</u>

Mass of NaCl (m) = 87.75 g

Volume of solution (V) = 500 ml = 0.5 L

Molar mass of NaCl (M) = 58.44 g/mol

<u>To determine:</u>

The molarity of NaCl solution

<u>Explanation:</u>

Molarity is defined as the number of moles of solute(n) dissolved per liter of solution (V)

i.e. M = moles of solute/liters of solution = n/V

Moles of solute (n) = mass of solute (m)/molar mass (M)

moles of NaCl = 87.75 g/58.55 g.mol-1 = 1.499 moles

Therefore,

Molarity of NaCl = 1.499 moles/0.5 L = 2.998 moles/lit ≅ 3 M

<u>Ans: (D)</u>

4 0
3 years ago
Read 2 more answers
How can you use a heating curve to find the melting and boiling point
lana66690 [7]

Answer:

Explanation:

A heating curve graphically represents the phase transitions that a substance undergoes as heat is added to it. ... The first change of phase is melting, during which the temperature stays the same while water melts. The second change of phase is boiling, as the temperature stays the same during the transition to gas.

3 0
3 years ago
The forensic technician at a crime scene has just prepared a luminol stock solution by adding 16.0 g of luminol into a total vol
nikitadnepr [17]

 The  molarity  of  the stock solution of  luminol  is 1.2 M


 <u><em>calculation</em></u>

step 1:  find the moles  of  luminol  using   (moles=  mass/molar mass)  formula


molar  mass  of Luminol= 177 g/mol

moles  is therefore= 16.0 g/ 177  g/mol=0.0904 moles


Step  2:  find the molarity  using (molarity= moles/volume in liters)  formula

     convert  Ml  into liters =  75.0/1000= 0.075 L

  molarity is therefore= 0.0904 moles/ 0.075 L= 1.2M

6 0
3 years ago
Which aqueous solution of KI freezes at the lowest temperature?
slavikrds [6]

Answer:

b. 2 mol of KI in 500. g of water

Explanation:

We have to apply the colligative property of freezing point depression.

The formula is: ΔT = Kf . m . i

As the (Kf . m . i) is higher, then the freezing temperature will be lower.

i refers to the Van't Hoff factor (number of ions dissolved in the solution)

KI → K⁺ + I⁻    (i =2)

Kf is constant so, we have to search for the highest m (molality)

Molality means the moles of solute in 1kg of solvent.

The highest m is option b → 2 mol of KI / 0.5 kg = 4 mol/kg

a. 1 mol of KI / 0.5 kg = 2 mol/kg

c. 1 mol of KI / 1kg = 1 mol/kg

d. 2 mol of KI / 1kg = 2 mol/kg

1000 g = 1kg. In order to determine molality we need to convert the mass (g) of solvent to kg

3 0
3 years ago
The acceleration of gravity on the moon is 1.6 m/s 2 and on earth it is 9.80 m/s 2. If the weight of a person on earth is 400 N,
photoshop1234 [79]
I think it might be about 65.31 N on the moon...I've never done this before but what I did was divide 400N by 9.8 to get their mass then multiply the MASS by 1.6 to get the WEIGHT on the moon
6 0
3 years ago
Read 2 more answers
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