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2 years ago

WILL MARK BRAINLIEST

Chemistry

2 answers:

vaieri [72.5K]2 years ago

7 0

Answer:D

Explanation:

gregori [183]2 years ago

3 0

Answer:

D) Group 18

Explanation:

Elements in group 18 doesn't't possess any of the properties above

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Please help and explain how to get the answer!

zzz [600]

Answer 1: The correct answer is option (B)

Answer 2: The correct answer is option (B)

Explanation 1:

$2Na+Cl_2\rightarrow 2NaCl$

moles of NaCl = $\frac{\text{given mass of NaCl}}{\text{molar mass of NaCl}}=\frac{200 g}{58.5 g/mol}=3.4188 mol$

According to reaction, 2 moles NaCl are obtained from 2 moles of Na, then 3.4188 moles of NaCl are obtained from: $\frac{1}{1}\times 3.4188$ moles of Na.

Mass of Na = moles of sodium × Molar mass of sodium

$=23 g/mol\times 3.4188 mol=78.632 g$

From the given option nearest answer to calculated answer is option (B) that is 78.65 g.

Explanation 2:

$2K+2H_2O\rightarrow 2KOH+H_2$

moles of potassium(K)= $\frac{\text{given mass of K}}{\text{molar mass of K}}=\frac{23.5 g}{39 g/mol}=0.6025 mol$

According to reaction, 2 moles of K gives 2 moles of KOH , then 0.6025 moles of K will give : $\frac{1}{1}\times 0.6025 moles$ of KOH

Mass of KOH = moles of KOH × Molar mass of KOH

$0.6025 mol\times 56 g/mol=33.74 g\approx 33.7 g$

From the given option nearest answer to calculated answer is option (A) that 33.7 g.

6 0

2 years ago

Calculate the kinetic energy of an electron ejected from a piece of sodium (Φ = 4.41x10–19 J) that is illuminated with 265 nm li

miss Akunina [59]

Answer:

Explanation:

Energy of falling radiation having wavelength of 265 nm

= h c / λ where h is plank's constant , c is velocity of light and λ is wavelength of radiation . Putting the values

Energy of light photon = 6.6 x 10⁻³⁴ x 3 x 10⁸ / 265 x 10⁻⁹

= .0747 x 10⁻¹⁷

= 7.47 x 10⁻¹⁹ J .

Work function of sodium is 4.41 x 10⁻¹⁹

So kinetic energy of ejected electron = energy of falling photon - work function

= 7.47 x 10⁻¹⁹ - 4.41 x 10⁻¹⁹

= 3.06 x 10⁻¹⁹ eV .

5 0

2 years ago

Explain why chlorine is a gas while iodine is a solid yet both are halogens. Select one: a. Both iodine and chlorine differ in s

yarga [219]

Answer:

Chlorine has strong inter molecular forces than iodine

Explanation:

3 0

2 years ago

Read 2 more answers

In order to plate a steel part having a surface area of 200 in.2 with a 0.002 in.-thick layer of nickel: (a) how many atoms of n

olga55 [171]

Answer :

(a) The number of atoms of nickel required are, $5.988\times 10^{23}$

(b) The moles of nickel are, and 0.9944 mol

Explanation : Given,

Area = $200in^2=200\times 6.45=1290cm^2$

Conversion used : $(1in^2=6.45cm^2)$

Thickness = 0.002 in = 0.002 × 2.54 = 0.00508 cm

Conversion used : (1 in = 2.54 cm)

First we have to calculate the volume of nickel.

Volume of nickel = Area × Thickness

Volume of nickel = $1290cm^2\times 0.00508cm$

Volume of nickel = $6.55cm^3$

Now we have to calculate the mass of nickel.

Mass of nickel = Density of nickel × Volume of nickel

Density of nickel = 8.91 g/cm³

Mass of nickel = 8.91 g/cm³ × 6.55 cm³

Mass of nickel = 58.36 g

Now we have to calculate the moles of nickel.

$\text{Moles of nickel}=\frac{\text{Mass of nickel}}{\text{Molar mass of nickel}}$

Molar mass of nickel = 58.69 g/mol

$\text{Moles of nickel}=\frac{58.36g}{58.69g/mol}=0.9944mol$

Now we have to calculate the number of atoms of nickel are required.

As, 1 mole of nickel contains $6.022\times 10^{23}$ atoms of nickel

So, 0.9944 mole of nickel contains $0.9944\times 6.022\times 10^{23}=5.988\times 10^{23}$ atoms of nickel

Thus, the number of atoms of nickel required and moles of nickel are, $5.988\times 10^{23}$ and 0.9944 mol respectively.

7 0

2 years ago

Why does in the golf stream warm and provide it’s Rhode Island or Bangor Maine

Charra [1.4K]

An ice cube in a pint glass demonstrates how the shrinking polar ice cap gives more flow to a stronger Gulf Stream, while an ice cube in the adjacent pint glass demonstrates why Gulf of Maine seawater is not warming faster than any other water body.

7 0

1 year ago