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a. 17%

b. 83%

c. 61%

d. 20%

e. 50%

2 months ago

Guest #9847816

2 months ago

Mass of K = 39.1g/mole

Mass of H = 1g/mole

Mass of C = 12g/mole

Mass of O = 16g/mole

Mass of KHCO3 = 39.1 + 1 + 12 + 3*16 = 100,1g/mole

100% ------------ 100.1g of KHCO3

x% ----------------- 12g of C

x = 11,99% of C in KHCO3

100% -------------- 100.1 of KHCO3

y% --------------------3*16g of O

y = 47,95% of O in KHCO3

100% ------------- 100.1g of KHCO3

z% ---------------- 1g of H

z = 0,99% of H in KHCO3

11,99% + 47,95% + 0,99% = 60,93% ≈ 61%

__answer: C__

Mass of H = 1g/mole

Mass of C = 12g/mole

Mass of O = 16g/mole

Mass of KHCO3 = 39.1 + 1 + 12 + 3*16 = 100,1g/mole

100% ------------ 100.1g of KHCO3

x% ----------------- 12g of C

x = 11,99% of C in KHCO3

100% -------------- 100.1 of KHCO3

y% --------------------3*16g of O

y = 47,95% of O in KHCO3

100% ------------- 100.1g of KHCO3

z% ---------------- 1g of H

z = 0,99% of H in KHCO3

11,99% + 47,95% + 0,99% = 60,93% ≈ 61%

Question

Which term is used for the tendency of an object to resist a change in its motion?

A. acceleration

B. displacement

C. momentum

D. inertia

A. acceleration

B. displacement

C. momentum

D. inertia

Solution 1

It's inertia. Inertia is the force that resists change in motion, like the planets and gravity. Inertia is effected by gravity

Solution 2

D. Inertia

Acceleration is the rate at which an object changes its velocity, displacement is the overall change in an object'a position, an momentum is mass in motion.

Acceleration is the rate at which an object changes its velocity, displacement is the overall change in an object'a position, an momentum is mass in motion.

Question

Which of the following can be achieved by using a visible-light spectrophotometer?

I. Detecting the presence of isolated double bonds.

II. Finding the concentration of a KMnO₄ solution.

III. Running a flame test to determine if Na+ or K+ is in a solution.

(A ) III only

(B ) II only

(C) I only

(D) II and III

(E ) I and II

I. Detecting the presence of isolated double bonds.

II. Finding the concentration of a KMnO₄ solution.

III. Running a flame test to determine if Na+ or K+ is in a solution.

(A ) III only

(B ) II only

(C) I only

(D) II and III

(E ) I and II

Solution 1

1 and 2 i think this is the answer

thnx u

thnx u

Question

Element X is found in two forms: 90.0% is an isotope that has a mass of 20.0, and 10.0% is an isotope that has a mass of 22.0. What is the atomic mass of element X?

A. 20.0

B. 20.2

C. 20.8

D. 21.2

E. 21.8

Can anyone explain this one for me?

A. 20.0

B. 20.2

C. 20.8

D. 21.2

E. 21.8

Can anyone explain this one for me?

Solution 1

[tex]M_{X} = \frac{(20.0\cdot 90\%)+(22.0\cdot10\%)}{100\%} = \frac{2020}{100} = 20.2[u][/tex]

answer: B

answer: B

Solution 2

The **relative** **atomic mass **of element X which has 2 isotopes is **20.2 u.**

**Relative atomic mass **of an element is an **average of masses **of atoms of** isotopes**. It is found out by the formula ,

relative atomic mass=(mass×abundance of isotope 1 )+(mass×abundance of isotope 2)/100

Considering the example given ,atomic mass of element X is found out as,

relative atomic mass=(20×90)+(10×22)/100=2020/100=20.2 u.

**Relative atomic mass** is a** dimensionless **physical quantity which is an average ratio of mass of atoms in a sample to the atomic mass** **constant.Atomic mass constant is** 1/12 **of **mass **of **carbon-12 atom**.

**Average atomic mass ** is relative atomic mass which is calculated from percent composition**.Relative atomic mass** is **unit less** and is a physical quantity.It is a multiple of standard atomic mass unit.

Learn more about **relative atomic mass**,here:

https://brainly.com/question/25698972

#SPJ2

Question

What is the weight of a toy car that has a mass of 0.28 kg?

Solution 1

2.744 Newtons, or 0.62 lbf (pounds force)

Question

What does a red shift indicate about a galaxy?

A. It is moving toward Earth.

B. It is moving very fast.

C. It is slowing down.

D. It is moving away from Earth.

A. It is moving toward Earth.

B. It is moving very fast.

C. It is slowing down.

D. It is moving away from Earth.

Solution 1

The only cause we know of that could shift the spectrum of a source toward longer wavelengths isthe source moving away from us. That's how we interpret the red shift when we see it, and that's where the whole idea of the expanding universe comes from. But ... just like gravity and the Earth going around the sun ... it can't be proved, so it's "only a theory".

Solution 2

Question

How many times more basic is a solution with a pH of 10 than a solution with a pH of 8

a. A pH of 10 is two times as basic

b. A pH of 8 is two times as basic

c. A pH of 10 is 2,000 times as basic

d. A pH of 8 is 20 times as basic

e. A pH of 10 is 100 times as basic

a. A pH of 10 is two times as basic

b. A pH of 8 is two times as basic

c. A pH of 10 is 2,000 times as basic

d. A pH of 8 is 20 times as basic

e. A pH of 10 is 100 times as basic

Solution 1

you may want to ask the questions seperatly more likely for someone to answer

Question

The combination of units written kg·m/s2 can be used for which of the following?

A. acceleration

B. mass

C. force

D. weight

A. acceleration

B. mass

C. force

D. weight

Solution 1

C. force because the force able to communicate to a mass of one kilogram an accerelation of 1m/s²

Kg.m

F= -------------

S²

Kg.m

F= -------------

S²

Solution 2

The combination of units written kg· [tex]m/s^{2}[/tex]can be used for **force.**

A **force** is just a factor that can impact an object's motion. A **force** may cause a mass item to accelerate by changing its velocity. A push as well as a pull can also be used to describe **forces**. A **force** is a vector quantity even though it has both magnitude , direction as well. It can be denoted by the symbol F.

The formula of **force **(F) = m×a.

where, m is mass of the particle and a is acceleration. It is known that unit of mass is kg and acceleration is [tex]m/s^{2}[/tex].

Now, put the unit of given data in above formula.

F= kg×[tex]m/s^{2}[/tex].

To know more about the **force** click here.

https://brainly.com/question/13191643.

#SPJ2

Question

What is an ion?

in chemistry

in chemistry

Solution 1

an atom with a charge

Solution 2

an ion is a atom that is charged.

Question

A car accelerates from 15 m/s to 25 m/s in 15 s. What is the car's acceleration?

Solution 1

Acceleration = (change in speed) / (time for the change)

Change in speed = (25 - 15) = 10 m/s

Time = 15 s

Acceleration = 10/15 =*2/3 m/s*

Change in speed = (25 - 15) = 10 m/s

Time = 15 s

Acceleration = 10/15 =

Question

Which of these follows a cyclical pattern?

A. sunspot maxima and minima

B. condensation of a nebula

C. formation of a crater

D. formation of a black hole

A. sunspot maxima and minima

B. condensation of a nebula

C. formation of a crater

D. formation of a black hole

Solution 1

The number of *sunspots*, observed during the past 300 years or so,

has been found to vary up and down in a cycle of very very roughly

about 11 years.

has been found to vary up and down in a cycle of very very roughly

about 11 years.

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