All categories

3 years ago

How many oxygen atoms are in 1.00 g of quartz?

1 answer:

4 0

<span>2.00 x 10^22 atoms The empirical formula for quartz is SiO2, so calculate the molar mass of quartz. Silicon = 28.0855 Oxygen = 15.999 Molar mass = 28.0855 + 2 * 15.999 = 60.0835 Now divide the mass you have of quartz by its molar mass 1.00 g / 60.0835 g/mol = 0.016644 mol Since you have 2 moles of oxygen atoms per mole of quartz, multiply by 2 0.016644 mol * 2 = 0.033288 mol Finally, multiply by avogadro's number to get the number of atoms. 0.033288 mol * 6.0221409e+23 atoms/mol = 2.00465 x 10^22 Round to 3 significant figures to get 2.00 x 10^22</span>

You might be interested in

f an electron has a mass of 9.709 x 10-31 kg, and a proton has a mass of 1.672 x 10-27 kg, approximately how many electrons are

VikaD [51]

Answer:

The answer is 1722 e⁻

Explanation:

Let's make a rule of three:

9.708×10⁻³¹ kg is the mass of 1 e⁻

1.672 ×10⁻²⁷ kg (which is 1 p⁺), how many e⁻ does it contain.?

1.672 ×10⁻²⁷ kg / 9.708×10⁻³¹ kg

The answer is 1722 e⁻

3 0

3 years ago

Sound waves are mechanical waves in which the particles in the medium vibrate in a direction parallel to the direction of energy

Marat540 [252]

Longitudinal wave is the another name.

3 0

4 years ago

A buffer solution contains 0.496 M hydrocyanic acid and 0.399 M sodium cyanide . If 0.0461 moles of sodium hydroxide are added t

pochemuha

Answer : The pH of the solution is, 9.63

Explanation : Given,

The dissociation constant for HCN = $pK_a=9.31$

First we have to calculate the moles of HCN and NaCN.

$\text{Moles of HCN}=\text{Concentration of HCN}\times \text{Volume of solution}=0.496M\times 0.225L=0.1116mole$

and,

$\text{Moles of NaCN}=\text{Concentration of NaCN}\times \text{Volume of solution}=0.399M\times 0.225L=0.08978mole$

The balanced chemical reaction is:

$HCN+NaOH\rightarrow NaCN+H_2O$

Initial moles 0.1116 0.0461 0.08978

At eqm. (0.1116-0.0461) 0 (0.08978+0.0461)

0.0655 0.1359

Now we have to calculate the pH of the solution.

Using Henderson Hesselbach equation :

$pH=pK_a+\log \frac{[Salt]}{[Acid]}$

Now put all the given values in this expression, we get:

$pH=9.31+\log (\frac{0.1359}{0.0655})$

$pH=9.63$

Therefore, the pH of the solution is, 9.63

4 0

3 years ago

Which is a true statement about an exterior angle of a triangle?

wolverine [178]

The only true statement about an exterior angle of a triangle from the above is that it forms a linear pair with one of the interior angles of the triangle.

<h3>What is a triangle?</h3>

A triangle can be defined as a one of the plane shapes which has three sides and three angles

So therefore, the only true statement about an exterior angle of a triangle from the above is that it forms a linear pair with one of the interior angles of the triangle.

Learn more about triangles:

brainly.com/question/2217700

#SPJ1

7 0

2 years ago

Suppose you start with a solution of red dye #40 that is 2.3 ✕ 10−5 M. If you do three successive volumetric dilutions pipetting

larisa [96]

Answer: Therefore, the concentration of final solution is $4.0\times 10^{-8}M$