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Naya [18.7K]
3 years ago
13

What is the mass of an atom with seven protons, seven neutrons, and eight electrons?

Chemistry
1 answer:
belka [17]3 years ago
6 0

Answer:

14

Explanation:

mass number = protons + neutrons

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Even though lead is toxic, lead compounds were used in ancient times as white pigments in cosmetics. What is the percentage of l
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<u>Answer:</u> The mass percent of lead in lead (IV) carbonate is 63.32 %

<u>Explanation:</u>

The given chemical formula of lead (IV) carbonate is Pb(CO_3)_2

To calculate the mass percentage of lead in lead (IV) carbonate, we use the equation:

\text{Mass percent of lead}=\frac{\text{Mass of lead}}{\text{Mass of lead (IV) carbonate}}\times 100

Mass of lead = (1 × 207.2) = 207.2 g

Mass of lead (IV) carbonate = [(1 × 207.2) + (2 × 12) + (6 × 16)] = 327.2 g

Putting values in above equation, we get:

\text{Mass percent of lead}=\frac{207.2g}{327.2g}\times 0100=63.32\%

Hence, the mass percent of lead in lead (IV) carbonate is 63.32 %

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