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Nookie1986 [14]

3 years ago

10

state the rules governing the number of significant figures that result from each of the following operations addition and subtr

action; mutiplication and divison

1 answer:

lubasha [3.4K]3 years ago

4 0

Adding and subtracting it's how many are behind the decimal, and multiply its how many digits

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A balloon contains helium gas expands from 230ml to 860 ml as more helium is added. What was the initial quantity of helium pres

Kisachek [45]

Answer:

n₁ = 1.0× 10⁻⁴ mol

Explanation:

Given data:

Initial volume of balloon = 230 mL

Initial number of moles of He =?

Final number of moles of He = 3.8 × 10⁻⁴ mol

Final volume of balloon = 860 mL

Solution:

The given problem will be solve through Avogadro law,

"Number of moles of gas and volume are directly proportional to each other at constant temperature and constant pressure"

Mathematical relationship:

V₁/n₁ = V₂/n₂

No we will put the values.

230 mL /n₁ = 860 mL/ 3.8 × 10⁻⁴ mol

n₁ = 230 mL× 3.8 × 10⁻⁴ mol/ 860 mL

n₁ = 874 × 10⁻⁴ mol. mL / 860 mL

n₁ = 1.0× 10⁻⁴ mol

6 0

3 years ago

Read 2 more answers

What is the molarity of an hno3 solution if 51.0 ml is needed to react with 25.0 ml of 0.150 mkoh solution? the equation is hno3

artcher [175]

<span>The Answer </span>should be<span> .074 M</span>

6 0

3 years ago

Elemnt name, atomic number, atomic mass, protons, neutrons, elsctrons 1-10

Anika [276]

<h2><em>Answer:</em></h2><h2><em>Hydrogen </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 1 </em></h2><h2><em> </em></h2><h2><em>Symbol: H </em></h2><h2><em> </em></h2><h2><em>Atomic Mass: 1 </em></h2><h2><em> </em></h2><h2><em>Protons: 1 </em></h2><h2><em> </em></h2><h2><em>Neutrons: 0 </em></h2><h2><em> </em></h2><h2><em>Electrons: 1 </em></h2><h2><em> </em></h2><h2><em>Helium </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 2 </em></h2><h2><em> </em></h2><h2><em>Symbol: He </em></h2><h2><em> </em></h2><h2><em>Atomic Mass: 4 </em></h2><h2><em> </em></h2><h2><em>Protons: 2 </em></h2><h2><em> </em></h2><h2><em>Neutrons: 2 </em></h2><h2><em> </em></h2><h2><em>Electrons: 2 </em></h2><h2><em> </em></h2><h2><em>Lithium </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 3 </em></h2><h2><em> </em></h2><h2><em>Symbol: Li </em></h2><h2><em> </em></h2><h2><em>Atomic Mass: 7 </em></h2><h2><em> </em></h2><h2><em>Protons: 3 </em></h2><h2><em> </em></h2><h2><em>Neutrons: 4 </em></h2><h2><em> </em></h2><h2><em>Electrons: 3 </em></h2><h2><em> </em></h2><h2><em>Beryllium </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 4 </em></h2><h2><em> </em></h2><h2><em>Symbol: Be </em></h2><h2><em> </em></h2><h2><em>Atomic Mass: 9 </em></h2><h2><em> </em></h2><h2><em>Protons: 4 </em></h2><h2><em> </em></h2><h2><em>Neutrons: 5 </em></h2><h2><em> </em></h2><h2><em>Electrons: 4 </em></h2><h2><em> </em></h2><h2><em>Boron </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 5 </em></h2><h2><em> </em></h2><h2><em>Symbol: B </em></h2><h2><em> </em></h2><h2><em>Atomic Mass: 11 </em></h2><h2><em> </em></h2><h2><em>Protons: 5 </em></h2><h2><em> </em></h2><h2><em>Neutrons: 6 </em></h2><h2><em> </em></h2><h2><em>Electrons: 5 </em></h2><h2><em> </em></h2><h2><em>Carbon </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 6 </em></h2><h2><em> </em></h2><h2><em>Symbol: C </em></h2><h2><em> </em></h2><h2><em>Atomic Mass: 12 </em></h2><h2><em> </em></h2><h2><em>Protons: 6 </em></h2><h2><em> </em></h2><h2><em>Neutrons: 6 </em></h2><h2><em> </em></h2><h2><em>Electrons: 6 </em></h2><h2><em> </em></h2><h2><em>Nitrogen </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 7 </em></h2><h2><em> </em></h2><h2><em>Symbol: N </em></h2><h2><em> </em></h2><h2><em>Atomic Mass: 14 </em></h2><h2><em> </em></h2><h2><em>Protons: 7 </em></h2><h2><em> </em></h2><h2><em>Neutrons:7 </em></h2><h2><em> </em></h2><h2><em>Electrons: 7 </em></h2><h2><em> </em></h2><h2><em>Oxygen </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 8 </em></h2><h2><em> </em></h2><h2><em>Symbol: O </em></h2><h2><em> </em></h2><h2><em>Atomic Mass: 16 </em></h2><h2><em> </em></h2><h2><em>Protons: 8 </em></h2><h2><em> </em></h2><h2><em>Neutrons: 8 </em></h2><h2><em> </em></h2><h2><em>Electrons: 8 </em></h2><h2><em> </em></h2><h2><em>Fluorine </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 9 </em></h2><h2><em> </em></h2><h2><em>Symbol: F </em></h2><h2><em> </em></h2><h2><em>Atomic Mass: 19 </em></h2><h2><em> </em></h2><h2><em>Protons: 9 </em></h2><h2><em> </em></h2><h2><em>Neutrons: 10 </em></h2><h2><em> </em></h2><h2><em>Electrons: 9 </em></h2><h2><em> </em></h2><h2><em>Neon </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 10 </em></h2><h2><em> </em></h2><h2><em>Symbol: Ne </em></h2><h2><em> </em></h2><h2><em>Atomic Mass: 20 </em></h2><h2><em> </em></h2><h2><em>Protons: 10 </em></h2><h2><em> </em></h2><h2><em>Neutrons: 10 </em></h2><h2><em> </em></h2><h2><em>Electrons: 10 </em></h2><h2><em> </em></h2><h2><em>Sodium </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 11 </em></h2><h2><em> </em></h2><h2><em>Symbol: Na </em></h2><h2><em> </em></h2><h2><em>Atomic Mass: 23 </em></h2><h2><em> </em></h2><h2><em>Protons: 11 </em></h2><h2><em> </em></h2><h2><em>Neutrons: 12 </em></h2><h2><em> </em></h2><h2><em>Electrons: 11 </em></h2><h2><em> </em></h2><h2><em>Magnesium </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 12 </em></h2><h2><em> </em></h2><h2><em>Symbol: Mg 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Number: 15 </em></h2><h2><em> </em></h2><h2><em>Symbol: P </em></h2><h2><em> </em></h2><h2><em>Atomic Mass: 31 </em></h2><h2><em> </em></h2><h2><em>Protons: 15 </em></h2><h2><em> </em></h2><h2><em>Neutrons: 16 </em></h2><h2><em> </em></h2><h2><em>Electrons: 15 </em></h2><h2><em> </em></h2><h2><em>Sulfur </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 16 </em></h2><h2><em> </em></h2><h2><em>Symbol: S </em></h2><h2><em> </em></h2><h2><em>Atomic Mass: 32 </em></h2><h2><em> </em></h2><h2><em>Protons: 16 </em></h2><h2><em> </em></h2><h2><em>Neutrons: 16 </em></h2><h2><em> </em></h2><h2><em>Electrons: 16 </em></h2><h2><em> </em></h2><h2><em>Chlorine </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 17 </em></h2><h2><em> </em></h2><h2><em>Symbol: Cl </em></h2><h2><em> </em></h2><h2><em>Atomic Mass: 35 </em></h2><h2><em> </em></h2><h2><em>Protons: 17 </em></h2><h2><em> </em></h2><h2><em>Neutrons: 18 </em></h2><h2><em> </em></h2><h2><em>Electrons: 17 </em></h2><h2><em> </em></h2><h2><em>Argon </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 18 </em></h2><h2><em> </em></h2><h2><em>Symbol: Ar </em></h2><h2><em> </em></h2><h2><em>Atomic Mass: 40 </em></h2><h2><em> </em></h2><h2><em>Protons: 18 </em></h2><h2><em> </em></h2><h2><em>Neutrons: 22 </em></h2><h2><em> </em></h2><h2><em>Electrons: 18 </em></h2><h2><em> </em></h2><h2><em>Potassium </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 19 </em></h2><h2><em> </em></h2><h2><em>Symbol: K </em></h2><h2><em> </em></h2><h2><em>Atomic Mass: 39 </em></h2><h2><em> </em></h2><h2><em>Protons: 19 </em></h2><h2><em> </em></h2><h2><em>Neutrons: 20 </em></h2><h2><em> </em></h2><h2><em>Electrons: 19 </em></h2><h2><em> </em></h2><h2><em>Calcium </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 20 </em></h2><h2><em> </em></h2><h2><em>Symbol: Ca </em></h2><h2><em> </em></h2><h2><em>Atomic Mass: 40 </em></h2><h2><em> </em></h2><h2><em>Protons: 20 </em></h2><h2><em> </em></h2><h2><em>Neutrons: 20 </em></h2><h2><em> </em></h2><h2><em>Electrons: 20</em> </h2>

4 0

3 years ago

Aluminum has a density of 2.70 g/mL. Calculate the mass (in grams) of a piece of aluminum having a volume of 405 mL .

bezimeni [28]

In this question, you are given the density (2.7g/ml) and the volume of the aluminum. You are asked how much the volume is. To answer this question, you need to convert the volume into mass. Since the unit used is already same, you don't need to convert it into another unit. The calculation would be:

mass= volume / density
mass= 405ml / (2.70 g/ml)
mass= 150grams

7 0

3 years ago

On which part of the carbon cycle have humans had the greatest impact? storage of co2 in the oceans all of the answer options ha

yarga [219]

Hello!

The part of the carbon cycle where humans had the greatest impact is the return of CO₂ to the atmosphere by burning of ancient organic matter.

The ancient organic matter is also called Fossil Fuels. Some Fossil Fuels are Petroleum and Coal. Fossil Fuels are used to power our society and are burned to provide energy for power plants and vehicles, and by burning them, Carbon Dioxide (CO₂) is produced, increasing the natural concentration of this compound in the atmosphere.

Have a nice day!

4 0

3 years ago