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2 years ago

ASAP ASAP ASAP ASAP

Chemistry

1 answer:

IrinaVladis [17]2 years ago

5 0

Answer:

Molar mass of NaN3,

MM = 1*MM(Na) + 3*MM(N)

= 1*22.99 + 3*14.01

= 65.02 g/mol

mass of NaN3 = 1.3*10^2 g

mol of NaN3 = (mass)/(molar mass)

= 1.3*10^2/65.02

= 2.0 mol

Balanced chemical equation is:

2NaN3(s) ---> 2Na(s) + 3N2(g)

According to balanced equation

mol of N2 formed = (3/2)* moles of NaN3

= (3/2)*2.0

= 3.0 mol

Molar mass of N2 = 28.02 g/mol

mass of N2 = number of mol * molar mass

= 3.0*28.02

= 84.0 g

Now use:

density = mass / volume

0.916 g/L = 84.0 g / volume

volume = 91.7 g

Answer: 91.7 g

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Sergeu [11.5K]

Answer:

The correct answer is "11.44 ml".

Explanation:

Molarity,

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Density,

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Volume,

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As we know,

⇒ $Molarity=\frac{No. \ of \ moles }{Volume \ of \ solution}$

or,

⇒ $No. \ of \ moles=Molarity\times Volume$

On putting the values, we get

⇒ $=0.2\times 1$

⇒ $=0.2 \ moles$

Now,

⇒ $No. \ of \ moles=\frac{Mass \ taken}{Molecular \ mass}$

or,

⇒ $Mass \ taken=No. \ of \ moles\times Molecular \ mass$

⇒ $=0.2\times 60.05$

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⇒ $=\frac{12.01}{1.05}$

⇒ $=11.44 \ ml$

7 0

2 years ago

What is the change in enthalpy when 11. 0 g of liquid mercury is heated by 15°c?

Vlad1618 [11]

Enthalpy change is the difference between energy used and energy gained. The change in enthalpy of the liquid mercury is 0.0231 kJ.

<h3>What is the enthalpy change?</h3>

Enthalpy change is the difference between the energy used to break chemical bonds and the energy gained by the products formed in a chemical reaction.

The enthalpy change is given by,

$\rm \Delta H_{rxn} = \rm q_{rxn}$

and,

$\rm q = mc\Delta T$

Given,

Mass of the liquid mercury (m) = 11.0 gm

The specific heat of mercury (c) = 0.14 J per g per degree Celsius

Temperature change = 15 degrees Celsius

Enthalpy change is calculated as:

$\begin{aligned} \rm q &= \rm mc\Delta T\\\\&= 11 \times 0.14 \times 15\\\\&= 23.1 \;\rm J\end{aligned}$

Therefore, 0.0231 kJ is the change in enthalpy.

Learn more about enthalpy change here:

brainly.com/question/10932978

#SPJ4

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1 year ago

Which of there is an indication that a chemical reaction has occurred?

Komok [63]

Answer is (b) , because a chemical change happened

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2 years ago

If 1 egg and 1/3 cup of oil are needed for each bag of brownie mix, how many bags of brownie mix do you need if you want to use

Charra [1.4K]

The answer is 3 bags total

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3 years ago

If 50.0 grams of HCl were dissolved in enough water to make a solution with a total volume of 5.0 liters, what would be the mola

SVETLANKA909090 [29]

The molarity of a solution is found to be 10 M.

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Molarity of a solution = <u>moles solute</u>

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2 years ago