3 years ago

Which unit is the same in the English and SI systems of measurement?

Chemistry

1 answer:

hram777 [196]3 years ago

5 0

Answer:

Explanation:

Metre is the correct answer

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this element has an atomic number lower than that of aluminum and one less valence electrons then the Group 16 elements

ahrayia [7]

This element is nitrogen (N)

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3 years ago

PLEASE HELP <br><br>If a mineral can scratch a penny, what number is it on Mohs Scale?

aniked [119]

Explanation:

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3 years ago

2.5 moles of gas occupies 50 L, how many moles of the gas would occupy 100L?

goldenfox [79]

Answer:

Explanation:

2.5M=50L

X =100L

2.5MX100L

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5OL 50L

=5 Moles

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3 years ago

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Airida [17]

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3 years ago

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Methane is the major component of natural gas. The standard molar enthalpy of formation of methane CH4 is -74.9 kJ/mol. For the

arlik [135]

Answer:

$\Delta _rH=-802.2kJ/mol$

Explanation:

Hello!

In this case, according to the given chemical reaction, it is possible to calculate the enthalpy change of the reaction via:

$\Delta _rH=\Delta _fH_{CO_2}+2\Delta _fH_{H_2O}-\Delta _fH_{CH_4}$

Since the enthalpy of formation of oxygen is 0. Thus, given the enthalpies of formation of gaseous carbon dioxide and water, we obtain:

$\Delta _rH=(-393.5kJ/mol)+2(-241.8kJ/mol)-(-74.9kJ/mol)\\\\\Delta _rH=-802.2kJ/mol$

Best regards!

3 0

3 years ago