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lisov135 [29]
3 years ago
6

Suppose you need to prepare 120.8 mL of a 0.249 M aqueous solution of NaCl. What mass, in grams, of NaCl do you need to use to m

ake the solution?
Chemistry
1 answer:
KATRIN_1 [288]3 years ago
4 0

The mass, in grams, of NaCl needed to use to make the solution is 1.76grams.

<h3>HOW TO CALCULATE MASS?</h3>

The mass of a substance can be calculated by multiplying the number of moles by its molar mass.

However, the number of moles must first be calculated by using the following expression:

Molarity = no. of moles ÷ volume

no. of moles = 0.249 × 0.1208

no. of moles = 0.03moles

Molar mass of NaCl = 23 + 35.5 = 58.5g/mol

mass of NaCl = 0.03 × 58.5 = 1.76g

Therefore, the mass, in grams, of NaCl needed to use to make the solution is 1.76grams.

Learn more about mass at: brainly.com/question/19694949

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Suppose hydrochloric acid reacts with potassium sulfite yielding water, sulfur dioxide, and potassium chloride. Suppose 4 moles
anzhelika [568]

Answer:

128 grams of sulfur dioxide are produced.

Explanation:

2HCl+K_2SO_3\rightarrow SO_2+2KCl+H_2O

Moles of HCl = 4 moles

According to reaction, 2 moles of HCl gives 1 mole of sulfur dioxide gas.

Then 4 moles of HCl will give:

\frac{1}{2}\times 4 moles=2 moles of sulfur dioxide gas.

Mass of sulfur dioxide gas = 2 mol × 64 g/mol = 128 g

128 grams of sulfur dioxide are produced.

4 0
3 years ago
How many grams of NaOH do you need to dissolve to make 1.55 Liters of a 1.55 Molar solution?
ale4655 [162]

Answer:

Mass = 96g

Explanation:

Molarity = number of moles/volume of solvent

According to the provided information, volume = 1.55L, Molarity = 1.55M

number of moles (n) = molarity × volume

n = 1.55 × 1.55

n = 2.4025

n = 2.40mol

For NaOH, molar mass = 23 + 16 + 1 = 40g/mol

mole = mass/molar mass

Mass = molar mass × mole

Mass = 40 × 2.40

Mass = 96g

6 0
3 years ago
Aspirin, like many pharmaceutical drugs, can access the cell because it is a weak acid. This occurs because Choose one: A. it is
sleet_krkn [62]

Answer:

Correct answer is (D). as a weak acid it can cross the membrane when in its uncharged form.

Explanation:

Aspirin (acetylsalicylic acid, ASA) is an analgesic and anti-inflammatory agent use in the treatment of gentle to moderate pain, inflammation and fever. It is absorb in the stomach and intestine in an unchanged form.

6 0
4 years ago
A tablet of Pain Be Gone Aspirin, which had a mass of 1.213 g, was pulverized and 1.159 g were dissolved in 10.0 mL of ethyl alc
allochka39001 [22]

Answer:

Moles of NaOH that reacted: n_{NaOH}=1.64*10^{-3}mol

Explanation:

During the  titration, all moles of NaOH added in the solution, react with the acetylsalicylic acid neutralizing each other.

The titration required 15.62 ml (0.01562 L) of the 0.1052 M NaOH solution. The moles of NaOH in that volume are:

n_{NaOH}=0.01562 L * \frac{0.1052mol}{L}

n_{NaOH}=1.64*10^{-3}mol

8 0
3 years ago
When NH3(g) reacts with O2(g), the products of the combustion are NO(g) and H2O(g). What volume of O2(g) is required to react wi
arlik [135]

<u>Answer:</u> The volume of oxygen gas required is 3.75 mL

<u>Explanation:</u>

STP conditions:

1 mole of a gas occupies 22.4 L of volume.

We are given:

Volume of ammonia reacted = 3.00 mL = 0.003 L    (Conversion factor:  1 L = 1000 mL)

The chemical equation for the reaction of ammonia with oxygen follows:

4NH_3(g)+5O_2\rightarrow 4NO(g)+6H_2O(g)

By Stoichiometry of the reaction:

(4 × 22.4) L of ammonia reacts with (5 × 22.4) L of oxygen gas

So, 0.003 L of ammonia will react with = \frac{(5\times 22.4)}{(4\times 22.4)}\times 0.003=0.00375L=3.75mL of oxygen gas

Hence, the volume of oxygen gas required is 3.75 mL

4 0
3 years ago
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