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2 years ago

Help me!!! Pleaseeee!!!!

Chemistry

1 answer:

Sidana [21]2 years ago

5 0

Answer:

0.862 J/gºC

Explanation:

The following data were obtained from the question:

Mass of metal (Mₘ) = 50 g

Initial temperature of metal (Tₘ) = 100 °C

Mass of water (Mᵥᵥ) = 400 g

Initial temperature of water (Tᵥᵥ) = 20 °C

Equilibrium temperature (Tₑ) = 22 °C

Specific heat capacity of water (Cᵥᵥ) = 4.2 J/gºC

Specific heat capacity of metal (Cₘ) =?

The specific heat capacity of the metal can be obtained as follow:

Heat lost by metal = MₘCₘ(Tₘ – Tₑ)

= 50 × Cₘ × (100 – 22)

= 50 × Cₘ × 78

= 3900 × Cₘ

Heat gained by water = MᵥᵥCᵥᵥ(Tₑ – Tᵥᵥ)

= 400 × 4.2 × (22 – 20)

= 400 × 4.2 × 2

= 3360 J

Heat lost by metal = Heat gained by water

3900 × Cₘ = 3360

Divide both side by 3900

Cₘ = 3360 / 3900

Cₘ = 0.862 J/gºC

Therefore, the specific heat capacity of the metal is 0.862 J/gºC

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Calculate the molar mass of a gaseous substance if 0.125 g of the gas occupies 93.3 mL at STP.

just olya [345]

Answer:

30.0g/mol

Explanation:

Step 1: Given data

Mass of the gas: 0.125 g

Pressure (P): 1 atm (standard pressure)

Temperature (T): 273.15 K (standard temperature)

Volume (V): 93.3 mL

Step 2: Calculate the moles of the gas

We will use the ideal gas equation.

$P \times V = n \times R \times T\\n = \frac{P \times V}{R \times T} = \frac{1atm \times 0.0933L}{\frac{0.0821atm.L}{mol.K} \times 273.15K} = 4.16 \times 10^{-3} mol$

Step 3: Calculate the molar mass of the gas

4.16 × 10⁻³ moles correspond to a mass of 0.125 g. The molar mass of the gas is:

$\frac{0.125g}{4.16 \times 10^{-3} mol} =30.0g/mol$

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3 years ago

O1S. Answer the following questions using Boyle's law:

Olenka [21]

Answer: 0.5 atm

Explanation:

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2 years ago

An analytical chemist has determined by measurements that there are 8.5 moles of magnesium in a sample of talc. How many moles o

MrRissso [65]

There are 5.66 moles of hydrogen in the sample of talc(hydrated magnesium silicate).

Given,

Talc formula is $Mg_{3} Si_4O_{10} (OH)_2$

moles of magnesium = 8.5 moles

The stoichiometry of magnesium and hydrogen is 3 : 2,

So 3 moles of magnesium is equivalent to 2 moles of hydrogen.

Then 8.5 moles of magnesium is equivalent to $\frac{2}{3} *8.5$ =5.6666 moles

Talc(hydrated magnesium silicate), often known as talcum, is a type of clay mineral made up of hydrated magnesium silicate, having the formula Mg3Si4O10(OH)2. Baby powder is made of powdered talc, frequently mixed with corn starch. This mineral serves as a lubricant and thickening agent. It serves as a component in paint, pottery, and roofing materials. It serves as a key component in many cosmetics. It can be found as foliated to fibrous aggregates and in a remarkably uncommon crystal form. It is foliated with a two-dimensional platy form, has a flawless basal cleavage, and an irregular flat fracture.

Talc(hydrated magnesium silicate), the softest mineral, is assigned a value of 1 on the Mohs scale of mineral hardness, which is based on scratch hardness comparisons.

Learn more about Talc here:

brainly.com/question/24082743

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2 years ago

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lukranit [14]

Answer:

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