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2 years ago

If the pressure is 0.9 kPa. and the volume is 4.0L, then the pressure changes to 0.20 kPa. What is the new volume?

Chemistry

1 answer:

ch4aika [34]2 years ago

4 0

Answer:

18 L

Explanation:

boyles law

P1V1 = P2V2

V2 = P1V1/P2

V2 = (.9 * 4)/.2

V2 = 18

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What is the mass of 5.130 moles of Table salt, sodium chloride (NaCl)

mina [271]

<em>The answer is 58.44277</em>

5 0

3 years ago

A reaction at −8.0°C evolves 854.mmol of boron trifluoride gas. Calculate the volume of boron trifluoride gas that is collected.

Bas_tet [7]

Answer: The volume of boron trifluoride gas that is collected is 18.6 L

Explanation:

According to the ideal gas equation:

PV=nRT

P = Pressure of the gas = 1 atm

V= Volume of the gas= ?

T= Temperature of the gas in kelvin = $-8.0^0C=273+(-8.0)=265K$

R= Gas constant = $0.0821Latm/Kmol$

n= moles of gas= 854 mmol = 0.854 mol (1mmol=0.001mol)

$1atm\times V=0.854\times 0.0821\times 265$

$V=18.6L$

Thus volume of boron trifluoride gas that is collected is 18.6 L

5 0

3 years ago

One liter of a buffer contains 2.00 Molar NaA and 2.00 Molar HA. (A- is the anion of an acid) 15.00 g NaOH is added. (Assume no

madam [21]

Answer:

The new pH is 10.8031

Explanation:

Given information:

[NaA] = concentration = 2 M

[HA] = concentration = 2 M

V = volume = 1 L

15 g of NaOH added

Question: What is the new pH, pH = ?

Moles of NaA:

$n_{NaA} =2\frac{moles}{L} *1L=2moles$

Moles of HA:

$n_{HA} =2\frac{moles}{L} *1L=2moles$

Moles of NaOH:

$n_{NaOH} =15g*\frac{1mol}{40g} =0.375moles$

The reaction:

HA + NaOH → NaA + H₂O

Moles of NaA = 2 + 0.375 = 2.375 moles

Moles of HA = 2 - 0.375 = 1.625 moles

The value of Ka is 2.3x10⁻¹¹

The pKa:

$pKa=-logKa=-log(2.3x10^{-11} )=10.6383$

Applying the Henderson's Hasselbach equation

$pH=pKa+log\frac{molesNaA}{molesHA} =10.6383+log\frac{2.375}{1.625} =10.8031$

3 0

3 years ago

How many elements are present in the compound ROMOS?

barxatty [35]

Two
A compound is a pure substance that can be decomposed into simpler substances. Compounds are made up of two or more elements. Compounds are represented by chemical formula using the symbols of the elements found in the compound

3 0

3 years ago

Consider the reaction 2AI(OH)3 + 3H2SO4 Right arrow. X + 6Y. What are X and Y? X = AI2(SO4)3; Y = H2O X = AI2(SO4)3; Y = H2 X =

Rom4ik [11]

Answer :

X = $Al_2(SO_4)_3$

Y = $H_2O$

Explanation :

Balanced chemical equation : It is defined as the equation in which total number of individual atoms on the reactant side is equal to the total number of individual atoms on product side.

The given chemical equation is:

$2Al(OH)_3+3H_2SO_4\rightarrow X+6Y$

As we know that when aluminum hydroxide react with sulfuric acid then it gives aluminum sulfate and water as product.

The balanced chemical reaction will be:

$2Al(OH)_3+3H_2SO_4\rightarrow Al_2(SO_4)_3+6H_2O$

Thus, X is $Al_2(SO_4)_3$ and Y is $H_2O$

4 0

3 years ago