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3 years ago

8

Which has greater volume, solution that is .45M created from 36g of NaCl or a solution that has 75g of CaCl2 and at a .5M soluti

on?

1 answer:

MariettaO [177]3 years ago

4 0

Answer:

the 1st one

Explanation:

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About 6 × 109 g of gold is thought to be dissolved in the oceans of the world. If the total volume of the oceans is 1.5 × 1021 L

Lelechka [254]

First, determine the number of moles of gold.

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

Given mass of gold = $6 \times 10^{9} g$

Molar mass of gold = 196.97 g/mol

Put the values,

Number of moles of gold = $\frac{6 \times 10^{9} g}{196.97 g/mol}$

= $0.03046\times 10^{9} mole$ or $3.046\times 10^{7} moles$

Now, molarity = $\frac{moles of solute}{volume of the solution in liters}$

Put the values, volume of ocean = $1.5 \times 10^{21} L$

Molarity = $\frac{3.046\times 10^{7} moles}{1.5 \times 10^{21} L}$

= $2.03\times 10^{-14} M$

Thus, average molar concentration = $2.03\times 10^{-14} M$

6 0

2 years ago

The PH solution of NH3 of 0.950molar solution is 11.612. find the Kb

Vaselesa [24]

Answer:

1.8 x 10⁻⁵

Explanation:

NH3(aq) + H2O(l) ⇄ NH4⁺(aq) + OH⁻(aq)

I 0.95 0 0

C -x +x +x

E 0.95-x x x

Kb= [NH₄⁺] [OH⁻] / ( NH₃) = x²/ (0.95-x )

P(OH) = 14-PH = 14-11.612 = 2.388

(OH)⁻¹ = 10⁻²°³⁸⁸ = 4.09 x 10⁻³ = x

Kb = (4.09 x 10⁻³)²/ (0.95-4.09 x 10⁻³)

= 1.8 x 10⁻⁵

8 0

3 years ago

What is the square root of the atomic number for manganese

Vanyuwa [196]

For this case, we have that by definition:

<em>Manganese is a chemical element that has an atomic number equal to 25. This element is located in group 7 of the periodic table of the elements. The symbol for this element in the periodic table is: Mn. </em>

Therefore, taking the square root we have:

$\sqrt {25} = 5$

Answer:

the square root of the atomic number for manganese is 5.

3 0

3 years ago

Which of the following is the best definition of a chemical change?

gladu [14]

Well apparently... a chemical change occurs when the process produces a gas, light, smell, a fire or heat, or a color change, like melting solid ice changing into water is not a chemical change

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2 years ago

Read 2 more answers

"When different parts of an organism work together in unison, things can be accomplished that could not happen otherwise." Expla

MAVERICK [17]

It’s different between each element.

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2 years ago