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2 years ago

Why don't elements in a group have consicutive atomic numbers?

Chemistry

2 answers:

slamgirl [31]2 years ago

7 0

Answer:

Periods have consecutive atomic number as they are in a row and groups are vertical meaning they are in a column and groups have similar properties

Ksivusya [100]2 years ago

6 0

Elements in a period have consecutive atomic numbers. Groups have same properties and not consecutive atomic numbers.

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What volume of CH4(g), measured at 25oC and 745 Torr, must be burned in excess oxygen to release 1.00 x 106 kJ of heat to the su

anastassius [24]

Answer:

$V=27992L=28.00m^3$

Explanation:

Hello,

In this case, the combustion of methane is shown below:

$CH_4+2O_2\rightarrow CO_2+2H_2O$

And has a heat of combustion of −890.8 kJ/mol, for which the burnt moles are:

$n_{CH_4}=\frac{-1.00x10^6kJ}{-890.8kJ/mol}= 1122.6molCH_4$

Whereas is consider the total released heat to the surroundings (negative as it is exiting heat) and the aforementioned heat of combustion. Then, by using the ideal gas equation, we are able to compute the volume at 25 °C (298K) and 745 torr (0.98 atm) that must be measured:

$PV=nRT\\\\V=\frac{nRT}{P}=\frac{1122.6mol*0.082\frac{atm*L}{mol*K}*298K}{0.98atm}\\\\V=27992L=28.00m^3$

Best regards.

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3 years ago

Why don't elements in a group have consicutive atomic numbers?​

Why don't elements in a group have consicutive atomic numbers?