All categories

1 year ago

What is the molality of 30g of NACI dissolved in 350g of water

Chemistry

2 answers:

ivolga24 [154]1 year ago

8 0

Answer:

1.47 m

Explanation:

The molality can be found using the following equation:

Molality = moles solute / mass (kg) solvent

In this case, NaCl is the solute and H₂O is the solvent. To find the molality, you need to (1) convert grams NaCl to moles (via the molar mass), then (2) convert grams H₂O to kilograms, and then (3) calculate the molality.

(Step 1)

Molar Mass (NaCl): 22.990 g/mol + 35.453 g/mol

Molar Mass (NaCl): 58.443 g/mol

30 grams NaCl 1 mole
-------------------------- x ------------------------ = 0.513 moles NaCl
58.443 grams

(Step 2)

1,000 grams = 1 kg

350 grams H₂O 1 kg
-------------------------- x ----------------------- = 0.35 kg H₂O
1,000 grams

(Step 3)

Molality = moles solute / mass (kg) solvent

Molality = 0.513 moles NaCl / 0.35 kg H₂O

Molality = 1.47 m

Anastasy [175]1 year ago

5 0

Answer:

1.45 mol/kg

Explanation:

nilered videos

You might be interested in

Select the correct answer. How does an atom become a positively charged ion? A. By gaining one or more electrons B. By gaining o

ser-zykov [4K]

C. By losing one or more electrons

6 0

3 years ago

Read 2 more answers

How do the two desalination processes differ from the atmospheric water generator in terms of where the processes can be used?

-Dominant- [34]

Water Desalination Processes. Water desalination processes separate dissolved salts and other minerals from water. Feedwater sources may include brackish, seawater, wells, surface (rivers and streams), wastewater, and industrial feed and process waters. Membrane separation requires driving forces including pressure (applied and vapor),...

Hope I helped :)

4 0

3 years ago

Relationships exist between the algae and coral?

S_A_V [24]

No, they do not. It is not true.

6 0

3 years ago

Read 2 more answers

A piece of magnesium is in the shape of a cylinder with a height of 6.62 cm and a diameter of 2.34 cm. If the magnesium sample h

frez [133]

Answer:

0.600 g/cm³

Explanation:

Step 1: Given data

Height of the cylinder (h): 6.62 cm

Diameter of the cylinder (d): 2.34 cm

Mass of the cylinder (m): 17.1 g

Step 2: Calculate the volume of the cylinder

First, we have to determine the radius, which is half of the diameter.

r = d/2 = 2.34 cm/2 = 1.17 cm

Then, we use the formula for the volume of the cylinder.

V= π × r² × h

V= π × (1.17 cm)² × 6.62 cm

V = 28.5 cm³

Step 3: Calculate the density (ρ) of the sample

The density is equal to the mass divided by the volume.

ρ = m/V

ρ = 17.1 g/28.5 cm³

ρ = 0.600 g/cm³

8 0

2 years ago

Using the following thermochemical equation, determine the amount of heat produced per kg of CO2 formed during the combustion of

Arisa [49]

Answer: 12033 kJ of heat produced per kg of $CO_2$ formed during the combustion of benzene

Explanation:

The balanced chemical equation for combustion of benzene is :

$2C_6H_6(l)+15O_2(g)\rightarrow 12CO_2(g)+6H_2O(g)$ $\Delta H°rxn$ = -6278 kJ

Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and $\Delta H$ for the reaction comes out to be negative.

$\text{Moles of }CO_2=\frac{\text{given mass}}{\text{Molar Mass}}=\frac{1000g}{44g/mol}=23mol$ (1kg=1000g)

According to stoichiometry :

12 moles of $CO_2$ on combustion produce heat = 6278 kJ

Thus 23 mole of $CO_2$ on combustion produce heat = $\frac{6278}{12}\times 23=12033kJ$

Thus 12033 kJ of heat produced per kg of $CO_2$ formed during the combustion of benzene

5 0

3 years ago