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3 years ago

I need help with homework

Chemistry

1 answer:

Aliun [14]3 years ago

5 0

Number 9 is A and 10 is A

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Phase changes occur because_____

timama [110]

B and c is the answer

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3 years ago

Calculate the number of ATOMS in 1.0 mole of O2.

Wewaii [24]

There is 6.02*10^23 molecule per mole. And there is 2 atoms per oxygen molecule. So the answer is 1.204*10^24 atoms in 1.0 mole of O2.

7 0

3 years ago

Read 2 more answers

7. In a remote area of Columbia, kids have to travel to school on a zip-line!

andriy [413]

Answer:

yes

Explanation:

Kids like fun things, and school is not fun , so if kids got to go to school on a zipline, attendance would be through the roof!

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3 years ago

List some general characteristic of producers and list and a few examples

kotykmax [81]

Answer:

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Explanation: fart

8 0

3 years ago

What is the mass of 1.7 × 1023 atoms of zinc (Zn)?

Rudiy27

Number of moles is defined as the ratio of given mass in g to the molar mass.

The mathematical formula is:

Number of moles = $\frac{given mass in g}{molar mass}$ (1)

Number of zinc atoms is equal to $1.7\times10^{23}$ , by Avogadro number, number of moles can be calculated.

As, 1 mol= $6.022\times10^{23}$ atoms, hence,

$1.7\times10^{23}\times\frac{1 mol}{6.022\times10^{23} }$

= 0.2822 mol

Now, from formula (1), calculate mass in g (molar mass of zinc = 65.4 g/mol)

0.2822 mol = $\frac{mass in g}{65.4 g/mol}$

mass in g = ${0.2822 mol \times 65.4 g/mol$

= 18.45588 g

Thus, by rounding off the above number, it will come near about 19 g approximately.

Hence, option (C) is the correct answer.

8 0

3 years ago