3 years ago

What does the mass number of an element represent?

2 answers:

8 0

Answer:

The mass number tells us the number (the sum of nucleons) of protons and neutrons in the nucleus of an atom. The atomic number (also known as the proton number) is the number of protons found in the nucleus of an atom. It is traditionally represented by the symbol z

Explanation:

Masteriza [31]3 years ago

5 0

Answer:

its amount of protons and neutrons

Explanation:

i just did it.

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How many grams of water form when 1.24 l of gas h2 at stp completely reacts with o2?

kati45 [8]

Balanced reaction for formation of water is ;
2H2 + O2 —> 2H2O
Stoichiometry of H2 to H20 is 2:2
1 mol of any gas occupies a volume of 22.4 L
Therefore it 22.4 L contains 1 mole
Then 1.24 L has -1/22.4 x 1.24 = 0.055 mol
Number of water moles formed = 0.055 mol
Therefore mass of water formed = 0.055 mol x 18 g/mol = 0.99 g of water is formed

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Answer:

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Explanation:

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larisa86 [58]

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