A mover packs books, CDs, and DVDs into a moving box. If the box contains 6.5 kg of books, 1.5 kg of CDs, and 2.0 kg of DVDs, what is the percent by mass of each object in the box?

Answers

Answer 1

Answer: Given:
M1 = 6.5 kg of books
M2 = 1.5 kg of CDs
M3 = 2.0 kg of DVDs

Required: percent by mass of each object

Solution:
First, we calculate the total mass.

M = 6.5 kg + 1.5 kg + 2.0 kg = 10 kg

Percent by mass is calculated by getting the ration of the mass of an object and the total mass multiplied by 100 to get the percent.

%M1 = 6.5 / 10 x 100 = 65%
%M2 = 1.5/10 x 100 = 15%
%M3 = 2.0/10 x 100 = 20%

Answer 2

Answer:

%M1 = 6.5 / 10 x 100 = 65%

%M2 = 1.5/10 x 100 = 15%

%M3 = 2.0/10 x 100 = 20%

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Why for thousand of years people believed that stars moved across earth sky

Answers

Because the earth rotates. and the stars and constellations are in their exact same spots in the universe. its the same as the sun. some people can argue that the sun moves east to west, but in reality, its because the earth is rotating. :)

btw, this is more like an earth science question, not chemistry.

Because they did not have the proper technology. Hope my answer was useful.

How many atoms of carbon are in the sample

Answers

there are six atoms in the carbon

What is the percent composition by mass of hydrogen in NH4HCO3 (gram-formula mass = 79 grams/mole)?

Answers

Answer:The percent composition by mass of hydrogen in $NH_4HCO_3$ is 6.32 %.

Explanation:

Molecular mass of the $NH_4HCO_3$ = 79 g/mol

Mass of the hydrogen atom present in one formula unit of $NH_4HCO_3$ :

$= 5* \text{(atomic mass of hydrogen)}=5* 1 g/mol= 5 g/mol}$

$\text{percentage of hydrogen}=\frac{\text{mass of the hydrogen in}NH_4HCO_3}{\text{molar mass of}NH_4HCO_3}* 100$

$\text{percentage of hydrogen}=(5g/mol)/(79 g/mol)* 100=6.32\%$

The percent composition by mass of hydrogen in $NH_4HCO_3$ is 6.32 %.

Answers: 6.3%

Explanation:

A 7.0 liter balloon at room temperature contains helium gas. if the temperature is halved, what happen to the volume?

Answers

The volume = 6.71 L

Further explanation

Charles's Law

When the gas pressure is kept constant, the gas volume is proportional to the temperature

$\tt (V_1)/(T_1)=(V_2)/(T_2)$

V₁=7 L

T₁=25 °C(room temperature) + 273 = 298 K

T₂=12.5(halved) + 273 = 285.5 K

$\tt (V_1)/(T_1)=(V_2)/(T_2)\n\n(7)/(298)=(V_2)/(285.5)\n\nV_2=6.71~L$

1. You were tasked to check if the liquid sample you have is a substance or a mixture.Which among these tasks is the BEST way to do so?
1. Color comparison
Il. Taste comparison
III. Boiling Test
iv.
Melting Test

Answers

Answer:

boiling test or melting test

Explanation:

All chemical reactions use reactants in a specific proportion or stoichiometry to form products. The __________ reactant regulates the amount of products produced. A) excess B) limiting C) proportional D) stoichiometric

Answers

The correct answer is B) Limiting.

Hope this helped!

Answer:

B: Limiting

Explanation:

The limiting reactant regulates the amount of products produced, because you have the least amount of the limiting reactant.

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