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3 years ago

Someone help with this please

Chemistry

1 answer:

Tju [1.3M]3 years ago

3 0

To me I think if the number of snakes increased, the number of rabbits decreases. Hope u got it correct ; )

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yan [13]

Covalent bonds are formed between atoms which have
- unsatisfied valency 
- no inert gas electronic configuration 
- These are directional bonds 
- formed by sharing of electrons 

Intermolecular forces 
- much weaker than covalent bond 
- These are not directional (except Hydrogen bonds) 
- These are more electrostatic in nature 
- exist between stable molecules 
- can be Hydrogen bonding, dipole-dipole and induced dipole-induced dipole

3 0

3 years ago

When coal is burned, the sulfur present in coal is converted to sulfur dioxide (SO2), which is responsible for the acid rain phe

solmaris [256]

Answer : The volume of $SO_2$ gas is, $2.75\times 10^6mL$

Explanation : Given,

Mass of S = 4.10 kg = 4100 g (1 kg = 1000 g)

Molar mass of S = 32 g/mol

First we have to calculate the moles of S.

$\text{Moles of }S=\frac{\text{Given mass }S}{\text{Molar mass }S}=\frac{4100g}{32g/mol}=128.125mol$

Now we have to calculate the moles of $SO_2$

The balanced chemical reaction is:

$S(s)+O_2(g)\rightarrow SO_2(g)$

From the balanced reaction, we conclude that

As, 1 mole of $S$ react to give 1 mole of $SO_2$

So, 128.125 mole of $S$ react to give 128.125 mole of $SO_2$

Now we have to calculate the volume of $SO_2$ by using ideal gas equation.

$PV=nRT$

where,

P = Pressure of $SO_2$ gas = 1.16 atm

V = Volume of $SO_2$ gas = ?

n = number of moles $SO_2$ = 128.125 mole

R = Gas constant = $0.0821L.atm/mol.K$

T = Temperature of $SO_2$ gas = $30^oC=273+30=303K$

Putting values in above equation, we get:

$1.16atm\times V=128.125mole\times (0.0821L.atm/mol.K)\times 303K$

$V=2747.65L=2.75\times 10^6mL$ (1 L = 1000 mL)

Therefore, the volume of $SO_2$ gas is, $2.75\times 10^6mL$

4 0

3 years ago

What amount of heat energy would be necessary to raise the temperature of 100 g of water at room temperature (25°C) to the boili

Stells [14]

Answer:

7.5 kcal

Explanation:

1.0 cal /g-C * 100 g * (100- 25 C) = 7500 cal = 7.5 kcal

4 0

3 years ago

Katerina is going to perform a reaction between Hydrochloric Acid (HCl) and solid Zinc. She needs to use 5 mols of HCl, how many

chubhunter [2.5K]

Answer:

182.3 g

Explanation:

number of mols of HCl = 5 mols

molecular weight of HCl = 36.46 g/mol

m = mass of HCl = number of mols x molecular weight

m = 5 mols * 36.46 g/mol

m = 182.3 g

8 0

3 years ago

Soda ash (sodium carbonate) is widely used in the manufacture of glass. Prior to the environmental movement much of it was produ

egoroff_w [7]

Answer:

NaCl is the limiting reactant

18.0g of CaCO3 are in excess

113.4g Na2CO3 are produced

118.7g CaCl2 are produced

Explanation:

To solve this question we need to convert the mass of each reactant to moles in order to find the limitng and excess reactant to find the amount of products that would be produced:

Moles CaCO3:

125g * (1mol / 100.09g) = 1.25 moles

Moles NaCl:

125g * (1mol / 58.44g) = 2.14 moles

For a complete reaction of 2.14 moles of NaCl are required:

2.14 moles NaCl * (1mol CaCO3 / 2 mol NaCl) = 1.07 moles of CaCO3.

As there are 1.25 moles, Calcium carbonate is the excess reactant and NaCl the limiting reactant

The moles of CaCO3 in excess are:

1.25mol - 1.07mol = 0.18mol CaCO3 and the mass is:

0.18mol CaCO3 * (100.09g / mol) = 18.0g of CaCO3 are in excess

The moles of Na2CO3 and CaCl2 produced are:

2.14 moles NaCl * (1mol Na2CO3-1mol CaCl2 / 2 mol NaCl) = 1.07 moles are produced.

The masses are:

1.07 mol Na2CO3 * (105.99g / mol) = 113.4g Na2CO3

1.07 mol CaCl2 * (110.98g / mol) = 118.7g CaCl2

8 0

3 years ago