Question

The mass of a an atom of helium is 6.65 x 10−24. Use scientific notation to express the mass of 250 helium atoms.

Answer 1

here is your answer

1mole=6.65×10^-24

therefore,

250mole=250×6.65×10^-24

1362.5×10^24

1.3625×10^21

Answer 2

Use scientific notation to express the mass of 250 helium atoms : $1.6625 \times 10^{-21}$

Solution:

Given that,

The mass of a an atom of helium is 6.65 x 10−24

$\text{Mass of 1 atom } = 6.65 \times 10^{-24}$

Use scientific notation to express the mass of 250 helium atoms

$\text{Mass of 250 atoms } = 250 \times \text{ Mass of 1 atom } \\\\\text{Mass of 250 atoms } = 250 \times 6.65 \times 10^{-24 }\\\\\text{Mass of 250 atoms } = 1662.5 \times 10^{-24 }$

In scientific notation ,

$\text{Mass of 250 atoms } = 1.6625 \times 10^{-24 + 3 } \\\\\text{Mass of 250 atoms } = 1.6625 \times 10^{-21}$

Thus mass of 250 atoms is found

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