CHEMISTRY HIGH SCHOOL

In the reaction C + 02 - CO2, 18 g of carbon react with oxygen to produce 72 g of carbon dioxide. What mass of oxygen would be needed in the reaction? O 18 g O 54 g O 72 g 0 90 g

Answers

Answer 1

Answer:

Mass of oxygen : 54 g

Further explanation

Conservation of mass applies to a closed system, where the masses before and after the reaction are the same

Reaction

$\tt C+O_2\rightarrow CO_2$

mass before reaction = mass after reaction

mass C + mass O₂= mass CO₂

$\tt 18~g+mass~O_2=72~g\n\nmass~O_2=72-18=\boxed{\bold{54~g}}$

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Which of the following is represented in the highest percentage by volume in dry air?a. Carbon dioxideb. Oxygenc. Hydrogend. Nitrogen
What is the total mass of solute in 1000. grams of a solution having a concentration of 5 parts per million?(1) 0.005 g (3) 0.5 g(2) 0.05 g (4) 5 g
The action of some commercial drain cleaners is based on the following reaction: 2 NaOH(s) + 2 Al(s) + 6 H2O(l) → 2 NaAl(OH)4(s) + 3 H2(g) What is the volume of H2 gas formed at STP when 6.32 g of Al reacts with excess NaOH?
2.0 cm + 2.6 cm + 4.2 mm = Please show work
Of the following reactions, which one produces oxygen gas?Fermentation Anaerobic respiration Aerobic respiration Photosynthesis

Boron occurs naturally as two isotopes. What is the difference between these isotopes? a)They have different numbers of electrons and different charges.
b)They have different numbers of neutrons and different charges.
c)They have different numbers of protons and different mass numbers.
d)They have different numbers of neutrons and different mass numbers.

Answers

atoms are made of 3 types of subatomic particles that are electrons, protons and neutrons.
the number of protons in the atom is called the atomic number. the atomic number is characteristic of the element.
the mass number is the sum of the number of protons and neutrons. Since protons and neutrons both have similar masses and they are located in the nucleus, the mass of the atom is the sum of protons and neutrons.
Isotopes are when 2 atoms of the same element have different number of neutrons. Therefore atomic number is the same but mass number is different as the number of neutrons vary.

correct answer for the difference between isotopes is
d)They have different numbers of neutrons and different mass numbers.

Boron occurs naturally as two isotopes that is they have the same number of protons and different numbers of neutrons with different atomic charges. Option D is correct.

What are isotopes?

These are the variations of elements having the same number of protons and electrons and different numbers of neutrons. As they are neutral in charge and their mass is totally negligible as compared to the mass of proton as they both are located at the center of the atom

The center of the atom is the nucleusas there are some more species of element isobars isotones isoelectronic. Isobars are those species that have the same neutronic numbers with different photonic and electronic numbers

The isotopes of boron are boron10, boron12, boron14, etc. .Carbon is another compound that is having 3 isotopes carbon12 carbon13, and caobon14. But mostly their properties are the same with a little difference between them

Therefore, the correct option is D.

Learn more about isotopes, here:

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Describe the motion of a ball being thrown straight up in the air in terms of kinetic and potential energy. as the ball rises up and falls back down, how is its kinectic and potential energy affected?

Answers

In your hand, the ball has higher potential energy than kinetic because it is still off of the ground but it isn't moving so there is no kinetic. As the ball rises, its potential and kinetic energy increases. At its peak, it has very high potential energy and very low kinetic energy. As it falls, the potential energy decreases but kinetic does not.

A gas at STP has a volume of 1.5 L. What will the pressure be if it is at 26° C occupying .75 L

Answers

Answer:

P₂ = 2.19 atm

Explanation:

Given data:

Initial volume = 1.5 L

Initial pressure =1 atm

Initial temperature = 273K

Final temperature = 26°C (26+273 = 299 K)

Final volume = 0.75 L

Final pressure = ?

Formula:

P₁V₁/T₁ = P₂V₂/T₂

P₁ = Initial pressure

V₁ = Initial volume

T₁ = Initial temperature

P₂ = Final pressure

V₂ = Final volume

T₂ = Final temperature

Solution:

P₂ = P₁V₁ T₂/ T₁ V₂

P₂ = 1 atm × 1.5 L × 299 K / 273 K × 0.75 L

P₂ = 448.5 atm .L. K / 204.75 K.L

P₂ = 2.19 atm

A solution of NaOH is titrated with H2SO4. It is found that 20.05 mL of 0.3564 M H2SO4 solution is equivalent to 43.42 mL of NaOH solution. What is the concentration of NaOH?

Answers

Answer : The concentration of NaOH is, 0.336 M

Explanation:

To calculate the concentration of base, we use the equation given by neutralization reaction:

$n_1M_1V_1=n_2M_2V_2$

where,

$n_1,M_1\text{ and }V_1$ are the n-factor, molarity and volume of acid which is $H_2SO_4$

$n_2,M_2\text{ and }V_2$ are the n-factor, molarity and volume of base which is NaOH.

We are given:

$n_1=2\nM_1=0.3564M\nV_1=20.05mL\nn_2=1\nM_2=?\nV_2=43.42mL$

Putting values in above equation, we get:

$2* 0.3564M* 20.05mL=1* M_2* 43.42mL$

$M_2=0.336M$

Thus, the concentration of NaOH is, 0.336 M

What is the affect of increasing the water's mass?how does it reflect it's temperature?

Answers

I assume what you're asking about is, how does the temperature changes when we increase water's mass, according the formula for heat ?
Well the formula is : $Q=m\cdot c\cdot \Delta t$ (where Q is heat, m is mass, c is specific heat and $\Delta t$ is change in temperature. So according this formula, increasing mass will increase the substance's heat, but won't effect it's temperature since they are not related. Unless, if you want to keep the substance's heat constant, in that case when you increase it's mass you will have to decrease the temperature