CHEMISTRY HIGH SCHOOL

A gas at 255 kilopascals and 45°C has an initial volume of 2.00L. The pressure of the gas increases to 805 kilopascals as the temperature is raised to 255°C. What will be the new volume?1.05 liters
2.28 liters
1.25 liters
0.44 liters
1.50 liters

Answers

Answer 1

Answer:

Answer : The correct option is, (a) 1.05 liters

Solution :

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

$(P_1V_1)/(T_1)=(P_2V_2)/(T_2)$

where,

$P_1$ = initial pressure of gas = 255 kpa

$P_2$ = final pressure of gas = 805 kpa

$V_1$ = initial volume of gas = 2 L

$V_2$ = final volume of gas = ?

$T_1$ = initial temperature of gas = $45^oC=273+45=318K$

$T_2$ = final temperature of gas = $255^oC=273+255=528K$

Now put all the given values in the above equation, we get the final volume of gas.

$(255kpa* 2L)/(318K)=(805kpa* V_2)/(528K)$

$V_2=1.05L$

Therefore, the final or new volume of gas will be, 1.05 liters

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To neutralize gastric juices in your stomach, antacids contain what

Answers

Antacid contains weak acid neutralizing substances like calcium carbonate and aluminum hydroxide. These compounds are slow acting as result does not provide fast relief from hyperacidity due to excess acids in the stomach.

Which substances dissolves in pure water and produces a solution that is a good conductor of electricity?1) CaCl2
2) C6H12O6
3) N2
4) O2

Answers

Answer:

$CaCl_2$

Explanation:

We have to keep in mind that a good conductor would be a substance that has the ability to produce ions (charged species). These species are responsible for the electricity conduction on water.

Therefore, we have to check which ones of these compounds will produce ions in water. For $N_2$ and $O_2$ we have diatomic molecules (also gases) this type of molecules don't have the ability to produce ions due to his simplicity, they already are very stable.

In the sugar molecule $C_6H_12O_6$ we have a covalent compound. The ions are produced by ionic compounds. So, this molecule can be discarded too.

For $CaCl_2$ we have an ionic compound that have the ability to produce ions:

$CaCl_2~~->~~Ca^+^2~+~2Cl^-$

So, this is the compound that would be a good conductor due to the $Ca^+^2$ and the $Cl^-$ ions.

CaCl2 is a good conductor of electricity when dissolved in water.

How many grams of CuSO4 are there in 100.0g of hydrate?

Answers

Usually copper(ii) sulfate has a hydrate form with 5 moles of water or copper (II) Sulfate pentahydrate or CuSO4.5H2O. To answer this, 100g of the hydrate is multiplied by the reciprocal of its molar mass then muliplied by the molar ratio of CuSO4 to CuSO4.5H2O. Then finally

Oxygen, nitrogen, and carbon are all ___________________.

Answers

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Calculate the number of moles
230 g of C2H5OH
560 g of C2H4
0.640 g of SO2

Answers

mass of C = 12g
mass of H = 1g
mass of O = 16g
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x moles of C2H5OH ----------- 230g
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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mass of H = 1g
mass of C2H4 = 28g = 1 mole

1 mole of C2H4 -------------- 28g
x moles of C2H4 ------------- 560g
x = 20 moles of C2H4
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mass of S = 32g
mass of O = 16g
mass of SO2 = 64g = 1 mole

1 mole of SO2--------------------- 64g
x mole of SO2 -------------------- 0,64g
x = 0,01 moles of SO2

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