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3 years ago

Conservation of Mass means:

Chemistry

2 answers:

g100num [7]3 years ago

8 0

Idk sorry !!‍♀️.......

Anarel [89]3 years ago

3 0

Answer:

Conservation of mass mean mass cannot be created nor destroyed

Explanation:

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A star's mass determines the —

kvasek [131]

It’s either A or C sorry I can’t help more

6 0

3 years ago

Given the following chemical reaction: 2 O2 + CH4 CO2 + 2 H2O What mass of CH4 is required to completely react with 100 grams of

AfilCa [17]

Answer:

The mass methane (CH4) required is, 25 grams (option C)

Explanation:

Mass of oxygen gas = 100 g

Molar mass of oxygen gas = 32 g/mole

Molar mass of methane gas = 16 g/mole

Step 1: Balance the reaction

2O2 + CH4 → CO2 + 2H2O

Step 2: Calculate the moles of O2:

Moles O2 = mass of O2 / Molar mass of o2

Moles O2 = 100g / (32g/mole) = 3,125 moles

⇒From the balanced reaction we conclude that 2 moles of O2 react with 1 mole of CH4

⇒ So, 3.125 moles of O2 react with 3.125/2 = 1.563 moles of CH4

Step 3: Calculate the mass of CH4:

Mass of CH4 = moles of CH4 x Molar mass of CH4

Mass of CH4 = 1.563 moles / (16g/ moles) = 25.008 grams CH4

6 0

3 years ago

Which of the following is an example of chemical energy being used?

AURORKA [14]

Answer:

(A) Battery in a flashlight

Explanation:

Because the chemicals in the battery are being converted to light and heat energy from the bulb!

8 0

3 years ago

Read 2 more answers

The brightness of a star is determined by _____.

d1i1m1o1n [39]

Answer:

Distance from the earth

Explanation: Trust me we just did this and I got 100 percent on all of it.

7 0

3 years ago

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How many moles of Cd and of N are contained in 132.4 g of Cd(N03)2-4H20? (b) How many molecules of water of hydration are in thi

ycow [4]

Answer: The given amount of $Cd(NO_3)_2.4H_2O$ contains 0.430 moles of Cd, 0.860 moles of N and $2.59\times 10^{23}$ molecules of water.

Explanation:

The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ ......(1)

Given mass of $Cd(NO_3)_2.4H_2O$ = 132.4 g

Molar mass of $Cd(NO_3)_2.4H_2O$ = 308.5 g/mol

Plugging values in equation 1:

$\text{Moles of }Cd(NO_3)_2.4H_2O=\frac{132.4g}{308.5g/mol}=0.430 mol$

1 mole of $Cd(NO_3)_2.4H_2O$ contains 1 mole of Cd, 2 moles of nitrogen atom (N), 10 moles of oxygen atom (O) and 8 moles of hydrogen atom (H).

So, 0.430 moles of $Cd(NO_3)_2.4H_2O$ will contain = $(1\times 0.430) = 0.430mol$ of Cd and $(2\times 0.430)=0.86mol$ of N

According to the mole concept:

1 mole of a compound contains $6.022\times 10^{23}$ number of molecules

So, 0.430 moles of $Cd(NO_3)_2.4H_2O$ will contain = $\frac{6.022\times 10^{23}}{1mol}\times 0.430mol=2.59\times 10^{23}$ number of water molecules.

Hence, the given amount of $Cd(NO_3)_2.4H_2O$ contains 0.430 moles of Cd, 0.860 moles of N and $2.59\times 10^{23}$ molecules of water.

4 0

3 years ago