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3 years ago

CAN SOMEBODY PLEASE HELP ME?

Chemistry

1 answer:

Ierofanga [76]3 years ago

6 0

Give any experiment you've learned so that I can explain thx.

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3. How many atoms in 3.91 moles of sodium?

Gala2k [10]

Answer:

Explanation:

The formula for sodium is Na. It does not form a molecule in some way.

1 mol Na = 6.02*10^23 atoms

3.91 mol = x Cross multiply

x = 3.91 * 6.02 * 10^23

x = 23.65 * 10^23

x = 2.365 * 10^24

Scientific notation is always expressed as a number 1 ≤ x < 10

3 0

3 years ago

(台)what is the answer

alukav5142 [94]

Answer:

google chrome

Explanation:

it is the home button on the top left corner

3 0

3 years ago

What is the percent of H in NH3

ale4655 [162]

$\frac{h3}{nh3}$

$\frac{1.008 \times 3}{(14.01) + (1.008 \times 3)} \times 100\% =$
ok, now press calculator. i dont have it now.

6 0

3 years ago

Read 2 more answers

What mass of HgO is required to produce 0.692 mol of O2? 2HgO(s) -> 2Hg(l) + O2(g)

Vika [28.1K]

The answer for the following problem is mentioned below.

Therefore 298.44 grams of mercuric oxide is needed to produce 0.692 moles of oxygen molecule

Explanation:

Given:

no of moles of the oxygen gas = 0.692

Also given:

2 HgO → 2 Hg + $O_{2}$

where,

HgO represents mercuric oxide

Hg represents mercury

$O_{2}$ represents oxygen

To calculate:

Molar mass of HgO:

Molar mass of HgO = 216 grams

molar mass of mercury (Hg) = 200 grams

molar mass of oxygen (O) =16 grams

HgO = 200 +16 = 216 grams

We know;

2×216 grams of HgO → 1 mole of oxygen molecule

? → 0.692 moles of oxygen molecule

= $\frac{2*216*0.692}{1}$

= 298.944 grams of HgO

Therefore 298.44 grams of mercuric oxide is needed to produce 0.692 moles of oxygen molecule

7 0

3 years ago

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PLEASE HELP ME!!!

irina [24]

that's the answer I think

6 0

2 years ago

Read 2 more answers