3 years ago

Hannah wants to make some toast for breakfast, but she has 3 minutes before she has to leave for school.

Chemistry

1 answer:

marusya05 [52]3 years ago

3 0

Answer: increase the temperature of the toaster oven.

Explanation:

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How many moles of disulfur decafluoride are present in 3.99 x 104 molecules of this compound? moles

arsen [322]

<u>Answer:</u> The number of moles of disulfur decafluoride is $6.62\times 10^{-20}$

<u>Explanation:</u>

We are given:

Number of disulfur decafluoride molecules = $3.99\times 10^4$

According to mole concept:

$6.022\times 10^{23}$ number of molecules are contained in 1 mole of a compound.

So, $3.99\times 10^4$ number of molecules will be contained in = $\frac{1mol}{6.022\times 10^{23}}\times 3.99\times 10^{4}=6.62\times 10^{-20}mol$ of disulfur decafluoride.

Hence, the number of moles of disulfur decafluoride is $6.62\times 10^{-20}$

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Which statement about isotopes is correct?

mestny [16]

Isotopes are the same elements with the same number of portions but different numbers of neutrons

For instance, the element carbon exists as several isotopes, each having the exact same number of protons (otherwise, it would no longer be carbon if the # of protons changes), and a different number of neutrons