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4 years ago

15

What physical property makes wax good for making molds for making sculptures

2 answers:

Scrat [10]4 years ago

8 0

<h2><u><em>It's malleability</em></u> Is what makes wax good for making molds </h2>

dmitriy555 [2]4 years ago

8 0

Answer:

<h2>Malleability.</h2>

Explanation:

Malleability is a physical property that allows the material to deformed without cracking. Thanks top this property, you can obtain very thins layer of some materials like wax. People often confuse this with ductilibility, but the difference is that the last one are forced to make threads of the material.

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The density of an unknown gas at 98°C and 740 mmHg is 2.50 g/L. What is the molar mass of the gas with work showed?

noname [10]

Answer:

78.2 g/mol

Step-by-step explanation:

We can use the <em>Ideal Gas Law</em> to solve this problem:

pV = nRT

Since n = m/M, the equation becomes

pV = (m/M)RT Multiply each side by M

pVM = mRT Divide each side by pV

M = (mRT)/(pV)

Data:

ρ = 2.50 g/L

R = 0.082 16 L·atm·K⁻¹mol⁻¹

T =98 °C

p = 740 mmHg

Calculation:

(a)<em> Convert temperature to kelvins </em>

T = (98 + 273.15) = 371.15 K

(b) <em>Convert pressure to atmospheres </em>

p = 740 × 1/760 =0.9737 atm

(c) <em>Calculate the molar mass </em>

Assume V = 1 L.

Then m = 2.50 g

M = (2.50 × 0.082 06 × 371.15)/(0.9737 × 1)

= 76.14/0.9737

= 78.2 g/mol

3 0

3 years ago

The air bags in cars are inflated when a collision triggers the explosive, highly exothermic decomposition of sodium azide (NaN3

Oksanka [162]

Answer : The mass of $NaN_3$ required is, 166.4 grams.

Explanation :

First we have to calculate the moles of nitrogen gas.

Using ideal gas equation:

$PV=nRT$

where,

P = Pressure of $N_2$ gas = 1.00 atm

V = Volume of $N_2$ gas = 113 L

n = number of moles $N_2$ = ?

R = Gas constant = $0.0821L.atm/mol.K$

T = Temperature of $N_2$ gas = $85^oC=273+85=358K$

Putting values in above equation, we get:

$1.00atm\times 113L=n\times (0.0821L.atm/mol.K)\times 358K$

$n=3.84mol$

Now we have to calculate the moles of sodium azide.

The balanced chemical reaction is,

$2NaN_3(s)\rightarrow 2Na(s)+3N_2(g)$

From the balanced reaction we conclude that

As, 3 mole of $N_2$ produced from 2 mole of $NaN_3$

So, 3.84 moles of $N_2$ produced from $\frac{2}{3}\times 3.84=2.56$ moles of $NaN_3$

Now we have to calculate the mass of $NaN_3$

$\text{ Mass of }NaN_3=\text{ Moles of }NaN_3\times \text{ Molar mass of }NaN_3$

Molar mass of $NaN_3$ = 65 g/mole

$\text{ Mass of }NaN_3=(2.56moles)\times (65g/mole)=166.4g$

Therefore, the mass of $NaN_3$ required is, 166.4 grams.

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3 years ago

Which of the following is an example of chemical energy being used?

adelina 88 [10]

A. Because the chemicals in the battery are being converted to light and heat energy from the bulb!

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3 years ago

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pls helpppppp now in the human body the digestion of proteins takes place primarily in which two organs?

olga_2 [115]

I believe it’s the small intestine

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3 years ago

What kind of covalent bond forms between two fluorine atoms?

Sloan [31]

A single covalent bond

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4 years ago