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3 years ago

Need a little help with chemistry If you don’t know, don’t put anything

Chemistry

2 answers:

asambeis [7]3 years ago

6 0

Answer:

1.2 kg

Explanation:

...

prisoha [69]3 years ago

6 0

Sorry I can’t help u I need points

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For an aqueous solution of sodium chloride (NaCl) .Determine the molarity of 3.45L of a solution that contains 145g of sodium

worty [1.4K]

Molar mass NaCl = 58.44 g/mol

number of moles:

mass NaCl / molar mass

145 / 58.44 => 2.4811 moles of NaCl

Volume = 3.45 L

Therefore :

M = moles / volume in liters:

M = 2.4811 / 3.45

M = 0.719 mol/L⁻¹

hope this helps!

6 0

3 years ago

A laser emits a green light with wavelength of 515 nm. Calculate the frequency of this light.

pentagon [3]

Answer:

$Frequency=5.83\times 10^{14}\ Hz$

Explanation:

The relation between frequency and wavelength is shown below as:

$c=frequency\times Wavelength$

c is the speed of light having value $3\times 10^8\ m/s$

Given, Wavelength = 515 nm

Also, 1 m = $10^{-9}$ nm

So,

Wavelength = $515\times 10^{-9}$ m

Thus, Frequency is:

$Frequency=\frac{c}{Wavelength}$

$Frequency=\frac{3\times 10^8}{515\times 10^{-9}}\ Hz$

$Frequency=5.83\times 10^{14}\ Hz$

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3 years ago

Which are the organs of the digestive system

Minchanka [31]

Answer:

The liver, pancreas, and gallbladder are the solid organs of the digestive system. The small intestine has three parts. The first part is called the duodenum.

Explanation:

8 0

3 years ago

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Given the density of iron (Fe) is 7.87 g/cm3, determine the mass of iron (in grams) in a rectangle block with the dimensions of

guapka [62]

Answer:

$m=14,105.71 g Fe$