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marta [7]
3 years ago
9

The density of lead is 11.3

Chemistry
2 answers:
brilliants [131]3 years ago
8 0
Volume = 287 - 206 
v= 81 mL 

Mass= density x volume 
m = 11.3 x 81 
m = 915.3 g



wariber [46]3 years ago
8 0

Answer:

915 g

Explanation:

The volume of lead (V) is equal to the difference between the final level of water and the initial level of water.

V = 287 mL - 206 mL = 81.0 mL

The density of lead (ρ) is 11.3 g/mL. We can find the mass of lead (m), in grams, using the following expression.

ρ = m/V

m = ρ × V

m = 11.3 g/mL × 81.0 mL

m = 915 g

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We can solve this by finding out the number of protons, and neutrons. Atomic number of an element means the number of protons in that element. So, the atom has 30 protons if the atomic number is 30.

On the other hand, mass number is the total number of protons and neutrons, but not electrons, because they're too light comparing to the other 2. Therefore, we can simply solve the number of neutrons in the atom by subtracting the number of protons from the mass number. 70 - 30 = 40.

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