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2 years ago

How many silicon atoms are there in 28.09 g of Si?

Chemistry

2 answers:

irinina [24]2 years ago

8 0

Explanation:

28.09 g of silicon contains 6.02×1023 6.02 × 10 23 silicon atoms.

mixer [17]2 years ago

3 0

1 mole = 6.02.10²³ particles (atoms, moleculs, ions)

mole Si = mass : molar mass

mole Si = 28.09 : 28.09 = 1

number of atoms = 1 x 6.02.10²³ = 6.02.10²³ atoms

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The radius of an atom of gold is 1.35 angstrom how many would have to be lined up to span 1.0 mm

Fed [463]

<span>(1.35 x 2 x 10^-10 m/atom) = 2.0 x 10^7 atoms</span>

8 0

4 years ago

WILL GIVE BRAINLIEST!!!

Fed [463]

Answer:

Isotopes, protons, netrons

Explanation:

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3 years ago

To 225 mL of a 0.80M solution of KI, a student adds enough water to make 1.0L of a more dilute KI solution. What is the molarity

Makovka662 [10]

Hope this helps you!

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3 years ago

Read 2 more answers

In the fall, how does the high pressure area<br> affect the hurricane?

tangare [24]

Answer:

Hurricanes occur when ocean water warms during the spring, summer and early fall.

Explanation:

Warm air just above the water’s surface rises. The rising warm air creates a reduction in pressure at the surface, what meteorologists call a low-pressure area. Because nearby air is at a higher pressure, it will flow into the low-pressure zone.

https://www.sidmartinbio.org/how-does-a-high-pressure-system-affect-a-hurricane/

3 0

3 years ago

The chemical reaction in this example is of environmental interest. Iron pyrite (Fesz) is often an impurity in

enot [183]

178.87 grams of sulphur dioxide is formed according to the equation given.

Explanation:

The balanced chemical reaction for the process is:

4 FeS2 + 11 O2 ⇒ 2Fe2O3(-) + 8 SO2

the reaction involving FeS and oxygen having balanced chemical equation as:

moles of oxygen given as 3.84

so when 11 moles of O2 reacts to form 8 moles SO2

3.84 moles of oxygen reacts to form x moles of SO2

$\frac{8}{11}$ = $\frac{x}{3.84}$

x = $\frac{30.72}{11}$

2.792 moles of sulphur dioxide will be formed

The mass can be calculated as number of moles x molar mass of 1 mole of SO2

= 2.792 x 64.066

= 178.87 grams of sulphur dioxide is formed.

7 0

4 years ago