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enot [183]
3 years ago
12

A sample of gas occupies a volume of 120.0 mL at a pressure of 0.75 atm and a temperature of 295 K. What will the volume be at a

pressure of 1.25 atm and a temperature of 345 K?
48 mL

4 mL

8 mL

84mL
Chemistry
1 answer:
MakcuM [25]3 years ago
6 0
The answer to the question is 84
(Step By Step Explanation).
P1 V1/T1= P2 V2/T2
::0.75 x 120/295 = 1.25 x V2/345
90/295= 1.25V2/345
(cross multiply )
1.25V2 x 295 = 90 x 345
368.75V2 = 31050
(divide by the coefficient of the unknown) .
368.75V2/368.75 = 31050/368.75
V2 = 84.2. = 84
::The volume is 82.
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A process uses 63,400 SCF/h of natural gas. What is the annual cost of natural gas used in the process?
artcher [175]

Explanation:

It is known that 1 SCF produces approximately 1000 Btu of thermal energy.

As it is not mentioned for how many hours the gas is used in this process. Therefore, we assume that the total number of hours natural gas used in this process are as follows.

        365 \times 24 = 8760 hours

Now, we will calculate the annual cost of natural gas used in the process as follows.

               8760 \times 63400

              = 555384000 SCF

Hence, annual cost of natural gas used in this process = loss of thermal energy

This will be equal to,  555384000 \times 1000

                           = 555,384,000,000 BTU

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3 years ago
PLEASE I NEED THIS ASAP
Vladimir79 [104]

Answer:3.3  

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-log(5x10^-4)

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Pb (NO3)2 (aq)+KCl (aq) Express answer as a chemical equation enter if reaction if no reaction occurs identify all phases
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Answer:

Pb (NO₃)₂(aq) + 2KCl(aq)     →   2KNO₃(aq)    +  PbCl₂(s)

Explanation:

In given chemical equation the aqueous lead (II) nitrate react with aqueous potassium chloride and form aqueous potassium nitrate and lead chloride.

Chemical equation:

Pb (NO₃)₂(aq) + KCl(aq)     →   KNO₃(aq)    +  PbCl₂(s)

Balanced chemical equation:

Pb (NO₃)₂(aq) + 2KCl(aq)     →   2KNO₃(aq)    +  PbCl₂(s)

ionic equation:

Pb²⁺ (aq) + 2NO₃⁻ (aq) + 2K⁺(aq)  +  2Cl⁻ (aq)    →     2NO₃⁻(aq)  + 2K⁺(aq)  +  PbCl₂(s)

Net ionic equation:

Pb²⁺ (aq) +  2Cl⁻ (aq)    →   PbCl₂(s)

The NO₃⁻(aq) and  K⁺(aq) are spectator ions that's why these are not written in net ionic equation. The PbCl₂ can not be splitted into ions because it is present in solid form.

Spectator ions:

These ions are same in both side of chemical reaction. These ions are cancel out. Their presence can not effect the equilibrium of reaction that's why these ions are omitted in net ionic equation.  

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