In chemistry, 6.022× 1023 is an important number called the avogadro constant (or avogadro\'s number). it expresses the number of atoms or molecules in a mole. notice that it is a really, really big number, as indicated by scientific notation with a large positive exponent. enter 6.022× 1023 into the calculator shown here. then, by trial and error, find the largest number that can be added to 6.022× 1023 without changing its displayed value (as shown on the screen).

4.4x10¹⁹

Explanation:

Hello,

In this case, if we consider the four significant figures Avogadro's number has, the maximum number that can be added without changing the displayed value is 4.4x10¹⁹ as the result will be:

Even when the value changes, the added fours do not round the last two of the Avogadro's number, thus, it will remain technically the same.

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hey there!

mass = 6.75 g

volume =   9 cm³

therefore:

d = mass / volume

d   = 6.75 / 9

d = 0.7 g/cm³

answer b