What is the molecular geometry if you have a double bond, a single bond and 1 lone pair around the central atom?


Answer 1


4 pairs are needed for the bonds, leaving 1 lone pair. Each double bond uses 2 bond pairs and can be thought of as a single unit. There are 2 double bond units and 1 lone pair, which will try to get as far apart as possible - taking up a trigonal planar arrangement.

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Given these reactions, X ( s ) + 1 2 O 2 ( g ) ⟶ XO ( s ) Δ H = − 668.5 k J / m o l XCO 3 ( s ) ⟶ XO ( s ) + CO 2 ( g ) Δ H = + 384.3 k J / m o l what is Δ H for this reaction? X ( s ) + 1 2 O 2 ( g ) + CO 2 ( g ) ⟶ XCO 3 ( s )


Answer: The \Delta H^o_(rxn) for the reaction is -1052.8 kJ.


Hess’s law of constant heat summation states that the amount of heat absorbed or evolved in a given chemical equation remains the same whether the process occurs in one step or several steps.

According to this law, the chemical equation is treated as ordinary algebraic expressions and can be added or subtracted to yield the required equation. This means that the enthalpy change of the overall reaction is equal to the sum of the enthalpy changes of the intermediate reactions.

The given chemical reaction follows:

X(s)+(1)/(2)O_2(g)+CO_2(g)\rightarrow XCO_3(s)      \Delta H^o_(rxn)=?

The intermediate balanced chemical reaction are:

(1) X(s)+(1)/(2)O_2(g)\rightarrow XO(s)    \Delta H_1=-668.5kJ

(2) XCO_3(s)\rightarrow XO(s)+CO_2     \Delta H_2=+384.3kJ

The expression for enthalpy of the reaction follows:

\Delta H^o_(rxn)=[1* \Delta H_1]+[1* (-\Delta H_2)]

Putting values in above equation, we get:

\Delta H^o_(rxn)=[(1* (-668.5))+(1* (-384.3))=-1052.8kJ

Hence, the \Delta H^o_(rxn) for the reaction is -1052.8 kJ.

MEASUREMENT AND MATTER Interconverting temperatures in Celsius and Kelvins The metal osmium becomes superconducting at temperatures below 655.mk Calculate the temperature at which osmium becomes superconducting in degrees Celsius. Be sure your answer has the correct number of significant digits. Ac


Answer: -272^0C.


Temperature of the gas is defined as the degree of hotness or coldness of a body. It is expressed in units like ^0C and K  

These units of temperature are inter convertible.

We are given:

Temperature of the gas = 655mK=0.655K    (1mK=0.001 K)

Converting this unit of temperature into ^0C by using conversion factor:



Thus 0.655K=(0.655-273.15)^0C=-272^0C

Thus the temperature is -272^0C.

How many neutrons does the isotope N-14 have?





N-14 has 7

i looked it up ye ur probably gonna get it right


7 protons + 7 neutrons!


Calculate the number of C atoms in 9.837 x 1024 molecules of CO2.

Please help




1 molecule contains 1 carbon atom.

9.837 * 10^24 molecules contains 9.837 * 10^24  atom of carbon.

It's a 1 to 1 ratio.

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