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2 years ago

What two pieces of information do u need to describe force

Chemistry

2 answers:

BlackZzzverrR [31]2 years ago

8 0

Mass and velocity are both factors needed to calculate force <span />

ss7ja [257]2 years ago

3 0

Answer : Mass and distance.

Explanation : The strength of the force between two objects mainly depends on two factors, one is mass and the other is distance.

The force of gravity that masses exert on each other is of great influencing factor. For example, if one of the masses is doubled, the force between the objects is doubled then the force between them increases.

When the distance between the objects is increased, then the force is found to decrease. For example, If the distance is doubled, then the force becomes one-fourth strong as it was before.

Force, it is often expressed as the product of mass and acceleration, and can be expressed as;

F = m x a;

where F - Force;

m - mass;

a - acceleration due to gravity.

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Combustion reactions are exothermic. The heat of reaction for the combustion of 2-methylheptane, C8H18, is 1.306×103 kcal/mol. W

WARRIOR [948]

Answer:

11.45kcal/g

2.612 × 10³ kcal

Explanation:

When a compound burns (combustion) it produces carbon dioxide and water. The combustion of 2-methylheptane can be represented by the following balanced equation:

2 C₈H₁₈ + 25 O₂ ⇄ 16 CO₂ + 18 H₂O

It releases 1.306 × 10³ kcal every 1 mol of C₈H₁₈ that is burned.

<em>What is the heat of combustion for 2-methylheptane in kcal/gram?</em>

We know that the molar mass of C₈H₁₈ is 114.0g/mol. Then, using proportions:

$\frac{1.306 \times 10^{3}Kcal}{1mol} .\frac{1mol}{114.0g} =11.45kcal/g$

<em>How much heat will be given off if molar quantities of 2-methylheptane react according to the following equation? 2 C₈H₁₈ + 25 O₂ ⇄ 16 CO₂ + 18 H₂O</em>

In this equation we have 2 moles of C₈H₁₈. So,

$2mol \times\frac{1.306 \times 10^{3}kcal }{1mol} =2.612\times 10^{3}kcal$

3 0

2 years ago

What's what's the Lewis structure for 2H2O

Umnica [9.8K]

Lewis Structure:

H -- O -- H (bent, Oxygen has 2 lone pairs)

Percent Composition

Hydrogen percent composition = [ 2 * (Hydrogen mass) ] / [Total mass of H2O]

Oxygen percent composition = [Oxygen mass] / [Total mass of H2O]

dose this make any sense...??

5 0

2 years ago

A substance is made up of 78.57% boron and 21.43% hydrogen. What is the formula for this compound?

zhuklara [117]

Anlllllllllllllllllll

Explanation:

fgghhjklljhhcxcvbn

7 0

1 year ago

Read 2 more answers

Suppose you have been given the task of distilling a mixture of hexane + toluene. Pure hexane has a refractive index of 1.375 an

miv72 [106K]

Explanation:

The given data is as follows.

Refractive index of mixture = 1.456

Refractive index of hexane = 1.375

Refractive index of toulene = 1.497

Let mole fraction of hexane = $x_{1}$

and, mole fraction of toulene = $x_{2}$

Also, $x_{1} + x_{2} = 1$

or, $x_{1} = 1 - x_{2}$

Hence, calculate the mole fraction of hexane as follows.

refractive index mixture= mole fraction hexane × ref index hexane + mole fraction toluene × ref index toluene.

1.456 = $(1 - x_{2}) \times 1.375 + x_{2} \times 1.497$

1.456 = $1.375 - 1.375x_{2} + 1.497x_{2}$

0.081 = $0.122x_{2}$

$x_{2}$ = $\frac{0.081}{0.122}$

= 0.66

Since, $x_{1} = 1 - x_{2}$

= 1 - 0.66

= 0.34

Thus, we can conclude that mole fraction of hexane in your sample is 0.34.

3 0

2 years ago

In texas, special elections are used to:

Vikki [24]

In Texas, special elections are used to ratify amendments to the Texas Constitution.

<h3>What is Election?</h3>

This is referred to a formal way of people voting for someone or for a type of cause.

Special elections which are held in Texas is done to ratify amendments to the constitution and is usually done by the legislature thereby making it the most appropriate choice.

Read more about Election here brainly.com/question/3710013

#SPJ1

5 0

1 year ago