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-Dominant- [34]
3 years ago
8

Which 2 elements make up the most mass in the human body?

Chemistry
2 answers:
liq [111]3 years ago
8 0

Answer: Oxygen and Carbon

Explanation:

Kay [80]3 years ago
3 0

Answer:po.op and pi.ss

Explanation:

This is a right answer

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Standard Thermodynamic Quantities for Selected Substances at 25 ∘C Reactant or product ΔHf∘(kJ/mol) Al(s) 0.0 MnO2(s) −520.0 Al2
Svet_ta [14]

Answer:

-1815.4 kJ/mol

Explanation:

Starting with standard enthalpies of formation you can calculate the standard enthalpy for the reaction doing this simple calculation:

∑ n *ΔH formation (products) - ∑ n *ΔH formation (reagents)

This is possible because enthalpy is state function meaning it only deppends on the initial and final state of the system (That's why is also possible to "mix" reactions with Hess Law to determine the enthalpy of a new reaction). Also the enthalpy of formation is the heat required to form the compound from pure elements, then products are just atoms of reagents organized in a different form.

In this case:

ΔH rxn = [(2 * -1675.7) - (3 * -520.0)] kJ/mol = -1815.4 kJ/mol

4 0
3 years ago
PlEasE help ASAP <br> Snskskssmskssm
salantis [7]

Answer:

message me on messenger johnpatrick so I can help you

5 0
2 years ago
convert 0.876 atm to mmHg. solution: multiply the atm value by 760.0 mmHg/ 1.0 atm 0875 atm x _______ = _______ mm Hg (3 sig fig
Akimi4 [234]

\tt \dfrac{760~mmHg}{1~atm}\times 0.876~atm=665~mmHg

5 0
1 year ago
Which of the following are reactants in the equation below? Select all that apply.
Paha777 [63]

Answer:

Zinc, copper sulfate

Explanation:

The reactants are the ones on the left side

8 0
2 years ago
The Top Thrill Dragster, a rollercoaster at Cedar Point in Ohio, soars through the air at 176ft/sec. How fast is this in mph?​
scoray [572]

Answer:

120mph

Explanation:

Google

divide the speed value by 1.467

or

176 times 60 second in a minute times 60 minutes in an hour

than divide by 5280 the amount of feet in a mile

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2 years ago
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