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larisa [96]
3 years ago
6

Which of these is an element? A. carbon B. carbon dioxide C. air D. water

Chemistry
2 answers:
Sloan [31]3 years ago
8 0
I think it's B carbon dioxide
Kaylis [27]3 years ago
4 0
Elements are pure substances. Carbon is the only one that is pure.
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Answer:

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Massive amounts of energy are contained in an atom's: Select one:
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4 years ago
Numbers in scientific notation must be expressed in this form m times 10^n where
enot [183]

Answer:

Hi there I think the awnser is B. or A. lol but im 90% its A.

Explanation:

xoxo hope this helps

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2 years ago
ammonia (NH3(g) Hf=-45.9 kJ/mol) reacts. with oxygen to produce nitrogen and water (H2O(g) Hf = -241.8 kJ/mol according to the e
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Answer:

ΔH°_rxn = -195.9 kJ·mol⁻¹

Explanation:

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The formula relating ΔH°_rxn and enthalpies of formation (ΔH°_f) is

ΔH°_rxn = ΣΔH°_f(products) – ΣΔH°_f(reactants)

ΣΔH°_f(products) = -6(241.8) = -1450.8 kJ

ΣΔH°_f(reactants) = -4(45.9) = -183.6 kJ

ΔH°_rxn =  (-1450.8 + 183.6) kJ = -1267.2 kJ

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3 years ago
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