Question

What is the mass of one mole of popcorn kernels? (sig fig hint: consider the precision of avogadro's number to determine the correct number of sig figs.)?

Answer 1

Answer:

$m=7.0106x10^22g$

Explanation:

Hello,

In this case we must take into account that the average mass of a dozen popcorn kernels is 1.416 g, therefore, the average mass of one popcorn kernel is:

$m=1.416g/12=0.118g$

Now, we also know that one mole of popcorn kernels has 6.022x10²³ popcorn kernels, therefore the mass of one mole of popcorn kernels is computed as shown below:

$m=1mol*\frac{6.022x10^{23}popcorn \ kernels }{1mol}*\frac{0.118g}{1popcorn\ kernels} \\m=7.0106x10^22g$

Best regards.

Answer 2

Since the mass of a single popcorn kernel is not given, lets us assume that it is 1 gram

Now:

1 mole of popcorn kernels contain $6.023 * 10^{23}$ kernels

Since:

1 kernel weighs 1 gram

Then,

$1 mole = 6.023 *10^{23}$ kernels would weigh $6.023 * 10^{23}$ grams