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3 years ago

Define the term compound

Chemistry

1 answer:

dalvyx [7]3 years ago

7 0

Answer:

A compound is a substance which contains two or more elements chemically combined together.

A compound is formed as a result of a chemical change.

Explanation:

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From the following data, calculate the average bond enthalpy for the NOH bond: NH3(g) ¡NH2(g) 1 H(g) ¢H° 5 435 kJ/mol NH2(g) ¡NH

Sphinxa [80]

Answer:

The average bond enthalpy for the N-H bond is 392 kJ/mol.

Explanation:

$NH_3(g) \rightarrow NH_2(g) +1 H(g),\Delta H^o_{1}= 435 kJ/mol$ ..[1]

$NH_2(g) \rightarrow NH(g) + H(g),\Delta H^o_{2}= 381 kJ/mol$ ..[2]

$NH(g) \rightarrow N(g)+ 1 H(g),\Delta H^o_{3}= 360 kJ/mol$ ..[3]

On adding [1] , [2] and [3] , we get:

$NH_3(g) \rightarrow N(g) +3H(g),\Delta H^o_{4}= ?$

$\Delta H^o_{4}=\Delta H^o_{1}+\Delta H^o_{2}+\Delta H^o_{3}$

$= 435 kJ/mol+381 kJ/mol +360 kJ/mol = 1,176 kJ/mol$

There three bonds N-H bond sin ammonia. Then average bond enthalpy of single N-H bond is :

$\Delta H^o_{N-H}=\frac{1,176 kJ/mol}{3}=392 kJ/mol$

The average bond enthalpy for the N-H bond is 392 kJ/mol.

4 0

3 years ago

Help please! worth 100 points!

IRINA_888 [86]

Answer:

THIS IS ONLY WORTH 50 POINTS LIAR LOL

Explanation:

BUT ILL DO IT ANYWAY GIVE ME A SEC

7 0

3 years ago

Read 2 more answers

3. What do we call atoms of the same elements with different mass numbers?

Talja [164]

Answer:

Isotopes

Explanation:

We call atoms of the same elements with different mass numbers isotopes.

7 0

3 years ago

What is the mass of a glucose solution that fills a 0.500-L intravenous bottle if the density of the glucose solution is

____ [38]

Answer:

m = 575 g

Explanation:

Given data:

Volume of solution = 0.500 L (0.500×1000 = 500 mL)

Density of glucose solution = 1.15 g/mL

Mass of glucose solution = ?

Solution:

Formula:

d = m/v

d = density

m = mass

v = velocity

Now we will put the values in formula.

1.15 g/mL = m/500 mL

m = 1.15 g/mL × 500 mL

m = 575 g

3 0

4 years ago

A 250 mL sample of gas is collected over water at 35°C and at a total pressure of 735 mm Hg. If the vapor pressure of water at 3

ELEN [110]

Answer:

The volume of the gas sample at standard pressure is <u>819.5ml</u>

Explanation:

Solution Given:

let volume be V and temperature be T and pressure be P.

$V_1=250ml$

$V_2=?$

$P_{total}=735 mmhg$

1 torr= 1 mmhg

42.2 torr=42.2 mmhg

so,

$P_{water}=42.2mmhg$

$T_1=35°C=35+273=308 K$

Now

firstly we need to find the pressure due to gas along by subtracting the vapor pressure of water.

$P_{gas}=P_{total}-P_{water}$

=735-42.2=692.8 mmhg

Now

By using combined gas law equation:

$\frac{P_1*V_1}{T_1} =\frac{P_2*V_2}{T_2}$

$V_2=\frac{P_1*}{P_2}*\frac{T_2}{T_1} *V_1$

$V_2=\frac{P_gas}{P_2}*\frac{T_2}{T_1} *V_1$

Here $P_2 \:and\: T_2$ are standard pressure and temperature respectively.

we have

$P_2=750mmhg \:and\: T_2=273K$

Substituting value, we get

$V_2=\frac{692.8}{750}*\frac{273}{308} *250$

$V_2= 819.51 ml$

4 0

2 years ago