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3 years ago

The standard enthapy of combustion of solid urea co(nh2)2 is -632kjmol-1 at 298k

Chemistry

1 answer:

Setler79 [48]3 years ago

8 0

Answer:

The standard enthalpy of combustion of solid urea ((CO(NH2)2) is -632 kJ mol-1 at 298 K and its standard molar entropy is 104.60 J K-1 mol-1

Explanation:

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Help will be much appreciated

UkoKoshka [18]

Answer:

+180kJ

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3 0

3 years ago

12 = 3X X = <br> 7X = 57 X = <br> 11X = 27.7 X =

dybincka [34]

Answer:
1. $x=4$
2. $x=\frac{57}{7}$
3. $x=\frac{27.7}{11}$

Explanation:

Given the following questions:

$12=3x$
$7x=57$
$11x=27.7$

In order to find the answers to these questions, we have to recognize that in order to isolate the variable we need to divide on both sides.

Question one:
$12=3x$
$\frac{3x}{3} =\div3$
$12\div3=4$
$x=4$

Question two:
$7x=57$
$\frac{7x}{7} =\div7$
$57\div7=8.14285714=\frac{57}{7}$
$x=\frac{57}{7}$

Question three:
$11x=27.7$
$\frac{11x}{11} \div11$
$27.7\div11=2.51818182=\frac{27.7}{11}$
$x=\frac{27.7}{11}$

Hope this helps.

3 0

2 years ago

Which of the following is true if an atom has 8 protons , 8 electrons and 9 neutrons ?

m_a_m_a [10]

You didn’t include options but if you want the element. 0-17 has 8 protons and 9 neutrons

8 0

4 years ago

How many molecules are in 2A1203? *

Triss [41]

Answer:

Explanation:

2A is a molecule Argon bond. so, it's 1 + 2+ 3

5 0

1 year ago

How many protons electrons and neutrons respectively does 29 CS have

irakobra [83]

$55 \; \text{e}^{-}$ , $55 \; \text{p}^{+}$ , and $74 \; \text{n}^{0}$ - in case cesium-129 is what you were referring to.

Cesium has atomic number $55$ as seen on a modern periodic table. A cesium atom nucleus would thus contain an equal number of protons; in addition to that, a <em>neutral</em> atom of cesium would contain the same number of electrons in its electron cloud.

For a particular isotope,

$\text{Mass number} = \text{Number of protons per nuclei} + \text{Number of Neutrons per nuclei}$ .

This isotope of cesium has a mass number of $129$ and contains $55$ protons in each atomic nucleus. One cesium nuclei would therefore contain $129 - 55 = 74$ neutrons.

8 0

3 years ago

The standard enthapy of combustion of solid urea co(nh2)2 is -632kjmol-1 at 298k​

The standard enthapy of combustion of solid urea co(nh2)2 is -632kjmol-1 at 298k