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3 years ago

Calculate the volume of 2.65 moles of CO2 gas at STP.

Chemistry

1 answer:

Harman [31]3 years ago

6 0

Answer:

The volume is 59, 3 liters. See the explanation below, please

Explanation:

STP conditions (standard) correspond to 273K of temperature and 1 atm of pressure. These values are used and the volume is calculated, according to the formula:

PV = nRT

1 atm x V= 2, 65 moles x 0, 082 l atm/K mol x 272 K

V= 2, 65 moles x 0, 082 l atm/K mol x 272 K/1 atm = 59, 3 liters

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A mixture contains NaHCO3 together with unreactive components. A 1.75 g sample of the mixture reacts with HA to produce 0.561 g

Lynna [10]

Answer:

$\%NaHCO_3=61.2\%$

Explanation:

Hello.

In this case, since the undergoing chemical reaction is only between the sodium bicarbonate and the acid HA:

$NaHCO_3+HA\rightarrow NaA+H_2O+CO_2$

For 0.561 g of yielded carbon dioxide (molar mass 44 g/mol), the following mass of sodium bicarbonate (molar mass 84 g/mol) that reacted was:

$m_{NaHCO_3}=0.561gCO_2*\frac{1molCO_2}{44gCO_2} *\frac{1molNaHCO_3}{1molCO_2} *\frac{84gNaHCO_3}{1molNaHCO_3} \\\\m_{NaHCO_3}=1.071g$

Considering the 1:1 mole ratio between CO2 and NaHCO3. Finally, the percent by mass of NaHCO3 is computed by dividing the mass of reacted NaHCO3 and t the mixture:

$\%NaHCO_3=\frac{1.071g}{1.75g}*100\%\\ \\\%NaHCO_3=61.2\%$

Best regards.

5 0

2 years ago

Calculate the concentration of H3O⁺ in a solution that contains 5.5 × 10-5 M OH⁻ at 25°C. Identify the solution as acidic, basic

harina [27]

Answer : The correct option is, (A) $1.8\times 10^{-10}M$ , basic.

Explanation : Given,

Concentration of $OH^-$ ion = $5.5\times 10^{-5}M$

First we have to calculate the pOH.

$pOH=-\log [OH^-]$

$pOH=-\log (5.5\times 10^{-5})$

$pOH=4.26$

Now we have to calculate the pH.

$pH+pOH=14\\\\pH=14-pOH\\\\pH=14-4.26=9.74$

Now we have to calculate the $H_3O^+$ concentration.

$pH=-\log [H_3O^+]$

$9.74=-\log [H_3O^+]$

$[H_3O^+]=1.8\times 10^{-10}M$

As we know that, when the pH value is less than 7 then the solution acidic in nature and when the pH value is more than 7 then the solution basic in nature.

From the pH value, 9.74 we conclude that the solution is basic in nature because the value of pH is greater than 7.

Therefore, the $H_3O^+$ concentration is, $1.8\times 10^{-10}M$ , basic.

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3 years ago

What is it called when a nucleus ejects high energy photons

Burka [1]

Answer:

Photodisintegration!

Explanation:

also called Phototransmutation, in physics, nuclear reaction in which the absorption of high-energy electromagnetic radiation (a gamma-ray photon) causes the absorbing nucleus to change to another species by ejecting a subatomic particle, such as a proton, neutron, or alpha particle.

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A rock was found on the side of the road. The rock was very crumbly, it had layers, and contained

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Answer:

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2 years ago

Criterion is the singular version of what word?

VARVARA [1.3K]

Answer:

Explanation:

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2 years ago

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