why couple use a method of birth control

Answer:

10 electrons

Explanation:

Answer:

B. 96.12 g

Explanation:

To solve this question we must convert each reactant to moles. Using the balanced equation we can find limiting reactant. With moles of limiting reactant we can find the moles of methanol and its mass:

Moles CO -Molar mass: 28.01g/mol-

140.1g CO * (1mol / 28.01g) = 5.0 moles CO

Moles H2 -Molar mass: 2.01g/mol-

12.12g * (1mol / 2.01g) = 6.03 moles H2

For a complete reaction of 5.0 moles of CO are required:

5.0moles CO * (2mol H2 / 1mol CO) = 10.0 moles of H2 are required

As there are just 6.03 moles, H2 is limiting reactant.

The moles of methanol produced are:

6.03 moles H2 * (1mol CH3OH / 2mol H2) = 3.015 moles CH2OH

Mass CH3OH -Molar mass32.04g/mol-:

3.015 moles CH2OH * (32.04g/mol) =

96.6g CH3OH ≈ B. 96.12 g

Answer:

Explanation:

You'r answer should be D

Answer:

A turbine takes the kinetic energy of a moving fluid, air in this case, and converts it to a rotary motion.

Explanation:

Answer:

A- 286.3L

Explanation:

Using the ideal gas law equation;

PV = nRT

Where;

P = pressure (atm)

V = volume (L)

n = number of moles (mol)

R = gas law constant (0.0821 Latm/molK)

T = temperature (K)

According to the information given in this question;

P = 1.14atm

V = ?

n = 15moles

T = 265K

Using PV = nRT

V = nRT ÷ P

V = (15 × 0.0821 × 265) ÷ (1.14)

V = 326.35 ÷ 1.14

V = 286.27 L

V = 286.3L

Answer:

TRUE

Explanation:

Answer:

This statement is true.........

Answer:

i think true

Explanation:

Answer:

they become water vapor and after that, they become a type of precipitation

Answer:

maybe not solid but a liquid yes

Answer:

yes

Explanation:

the molecules move

Answer:

R is the ideal gas constant

Answer:

aqueous solutions of silver nitrate and sodium chloride turn cloudy after mixing aqueous solutions of hydrochloric acid and sodium hydrogen carbonate produces bubbles on mixing Sodium hydroxide is mixed with water and the container feels warmer

Explanation:

A chemical change involves the formation of new substances. Also heat is absorbed or released in a chemical change. Another name for a chemical change is a chemical reaction.

In the first case, a reaction of the sort;

AgNO3(aq) + NaCl(aq) ---> AgCl(s) + NaNO3(aq)

The cloudy solution is due to the formation of AgCl precipitate.

In the second case, a reaction of the sort;

HCl(aq) + NaHCO3(aq) ---> NaCl(aq) + CO2(g) + H2O(l)

The gas evolved is due to the formation of CO2 in the process. Heat is also evolved showing that it is a chemical change.

An insect needs mud wallows to breed; that insect pollinates several flowers in that ecosystem.

Having mud in an ecosystem is important because Insects are very important as primary or secondary decomposers in the ecosystem. These insects need mud wallows to breed. That insect pollinates several flowers in that ecosystem.

Therefore, the mud in an ecosystem is most important as it provides a place for insects to breed and these insects play a major role in the ecosystem like pollination.

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Answer:

You can view more details on each measurement unit: molecular weight of Potassium or grams The molecular formula for Potassium is K. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Potassium, or 39.0983 grams.

Explanation:

To Find :

Gas’s temperature in Celsius when it has a volume of 25 L, 203 mol, 143.5 atm .

Solution :

We know, by ideal gas equation :

[tex]PV =nRT\\\\T = \dfrac{PV}{nR}[/tex]

Here, R is universal gas constant and [tex]R = 0.082 \ L \ atm \ mol^{-1} \ K^{1}[/tex]

Putting all given values and R in above equation, we get :

[tex]T = \dfrac{PV}{nR}\\\\T = \dfrac{143.5\times 25}{203 \times 0.082}\ K\\\\T = 215.52\ K[/tex]

Hence, this is the required solution.

Answer:

Reverse osmosis systems find frequent use in the following: Boiler feed-water treatment: used to reduce solids content of waters prior to feeding into boilers for power generation or otherwise.

Explanation:

Answer:

Explanation:

Given that:

The mass of aluminium oxide Al₂O₃ = 2000 kg = 2000 000 g

Molar mass of Al₂O₃ = 101.96 g/mol

no of moles = mass / molar mass

no of moles of Al₂O₃ = 2000 000 g/ 101.96 g/mol

no of moles of Al₂O₃ = 19615.4 mol

From the reaction:

4Al + 3O₂  ⇒  Al₂O₃

To determine the moles of O₂ in Al₂O₃:

Then;

19615.4 mol * 3/2 mol of O₂ = 29423.1

The mass of oxygen now = 29423.1  × 32 g

= 941539.2 g

To kg;

= (941539.2 / 1000) kg

= 941.5 kg

Answer:yes they do represent

Answer is #4 (neutrons)

Explanation:

Total mass before the reaction is 236 amu. The total mass of the two elements is 233 amu. This means that there are 3 amus carried by element X. Looking at the total atomic number of the two elements after reaction, it's 92, the same as the one at the beginning. This means that element X has zero atomic number, which could only be a neutron.

Answer: is 4

Explanation:

I was doing the same one

Answer:

180 mmHg

Explanation:

Total volume of gases = 20% + 80%= 100%

Total pressure of gases = 900 mm Hg

Note that partial pressure of a gas = mole fraction × total pressure

Mole fraction of oxygen = 20/100

Hence partial pressure of oxygen= 20/100 × 900 mm Hg

partial pressure of oxygen= 180 mmHg

Answer:

2 halo - propane

Explanation:

We are told that a halo alkane is heated with sodium in the presence of dry ether to produce 2,3 - dimethyl butane.

Now, according to Wurtz reaction this formation from heating with sodium in the presence of dry ether is done by 2 alkyl halides in the form of;

2RX + 2Na → R−R + 2Na+X−

Now, formula for 2,3 dimethyl butane is (CH₃)₂CHCH(CH₃)₂

Thus, from the Wurtz reaction, we can write that;

2RX + 2Na → (CH₃)₂CH - CH(CH₃)₂ + 2Na+X−

So, R = (CH₃)₂CH

This means the original halo alkane has 3 carbon atoms and thus, we can say it is 2 halo - propane.

Answer:

It has a lower density in its solild stae than it does in its liquid state.

Explanation:

Ice floats, allowing life underneath to leave despite the top freezing.

The statement that describes a unique property of water that helps sustain marine life is that has a lower density in its solid state than it does in its liquid state.

Water is a unique molecule that possesses unique properties as follows:

These unique characteristics of water helps aquatic organisms sustain life in a marine environment.

Therefore, statement that describes a unique property of water that helps sustain marine life is that has a lower density in its solid state than it does in its liquid state.

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Answer:

N2 +3 H2 → 2 NH3

so we have 2180 g of N2

or 2.80 g ÷ 28.02 g/mol = 0.100 mol

1 mol of N2 react with 3 moles of H2

Therefore 0.100 mol of N2 react with 0.3 moles of H2

0.300 mol X Molar mass (2.00 g/mol) = 0.600 g

0.600 g of H[tex]_2[/tex] are needed to react with 2.80 g of  N[tex]_2[/tex].  Mole is one of the International System for Units' seven foundation units (SI).

A mole is just a measuring scale. In reality, it is one of the International System for Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created. Using absolute amounts of atoms, molecules, or ions would be problematic as well since chemical reactions frequently occur at levels that use grams would be inappropriate.

A mole consists of precisely 6.022140761023 particles. The "particles" might be anything, from tiny things like electrons and atoms to enormous things like stars or elephants.

N[tex]_2[/tex] +3 H[tex]_2[/tex] → 2 NH[tex]_3[/tex]

2.80 g ÷ 28.02 g/mol = 0.100 mol of N[tex]_2[/tex]

1 mol of N[tex]_2[/tex] react with 3 moles of  H[tex]_2[/tex]

0.100 mol of  N[tex]_2[/tex] react with 0.3 moles of H[tex]_2[/tex]

0.300 mol X Molar mass (2.00 g/mol) = 0.600 g of H[tex]_2[/tex]

Therefore, 0.600 g of H[tex]_2[/tex] are needed to react with 2.80 g of  N[tex]_2[/tex].

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Answer: Groups

Explanation:

I took the quiz

Answer:

0.0286M

Explanation:

Using the formula as follows:

CaVa = CbVb

Where;

Ca = concentration of HCl acid (M)

Cb = concentration of NaOH base (M)

Va = volume of HCl acid (mL)

Vb = volume of NaOH base (mL)

According to the information provided in this question;

Ca = 0.10 M

Cb = ?

Va = 10mL

Vb = 35mL

Using CaVa = CbVb

Cb = CaVa/Vb

Cb = (0.10 × 10) ÷ 35

Cb = 1 ÷ 35

Cb = 0.0286M

Answer: The correct number of significant figures in [tex]7.68 \times 4.564[/tex] is 35.05152.

Explanation:

Digits present in a number that helps in determining the degree of accuracy starting from the first non-zero digit is called a significant figure.

Some rules for significant figures are as follows.

For example, 2085 contains 4 significant digits.

For example, 0.0034 has 2 significant digits.

For example, 0.02500 has 4 significant figures.

For example, 19000 has 2 significant digits.

Now, the product of given digits is as follows.

[tex]7.68 \times 4.564 = 35.05152[/tex]

Thus, we can conclude that correct number of significant figures in [tex]7.68 \times 4.564[/tex] is 35.05152.

Answer: The answer is A.

Answer:

please where is the Gibb free energy to indicate if its exothermic or endothermic reaction but the chemical equation is homogeneous one.

Answer:

The pitch of a sound is related to its frequency.

Explanation:

The higher the frequency, the higher the pitch will be

Amplitude is related to how loud a sound is

Answer:

The answer is 44.0095. We assume you are converting between grams CO2 and mole.

I hope it help you

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