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REY [17]
3 years ago
5

Methane is approximately 23 times more powerful than carbon dioxide as a greenhouse gas. Which are significant sources of methan

e emissions
Chemistry
1 answer:
ratelena [41]3 years ago
5 0

Answer:

anthropogenic sources like landfills, agricultural activities,coal mining and combustion and some sources are natural ones

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What is the percentage composition of each element in hydrogen peroxide, H2O2?
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Answer:

The percentage composition of each element in H2O2 is 5.88% H and 94.12% O (Option D).

Explanation:

Step 1: Data given

Molar mass of H = 1.0 g/mol

Molar mass of O = 16 g/mol

Molar mass of H2O2 = 2*1.0 + 2*16 = 34.0 g/mol

Step 2: Calculate % hydrogen

% Hydrogen = ((2*1.0) / 34.0) * 100 %

% hydrogen = 5.88 %

Step 3: Calculate % oxygen

% Oxygen = ((2*16)/34)

% oxygen = 94.12 %

We can control this by the following equation

100 % - 5.88 % = 94.12 %

The percentage composition of each element in H2O2 is 5.88% H and 94.12% O (Option D).

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A ___________________________ is made of two or more different substances.
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