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IRISSAK [1]
3 years ago
7

A system of gas at low density has an initial pressure of 1.90 × 10 5 1.90×105 Pa and occupies a volume of 0.18 m³. The slow add

ition of 965 J of heat to the system causes it to expand isobarically to a volume of 0.51 m³. What is the change in the internal energy of the system?
Chemistry
1 answer:
Bad White [126]3 years ago
8 0

Answer:

ΔU = -6.2 × 10⁴ J

Explanation:

The system absorbs 965 J of heat, that is, q = 965 J.

The work (w) can be calculated using the following expression.

w = -P . ΔV

where,

P is the external pressure

ΔV is the change in the volume

w = - (1.90 × 10⁵ N/m²) × (0.51 m³ - 0.18 m³) = -6.3 × 10⁴ J

The change in the internal energy (ΔU) is:

ΔU = q + w = 965 J + (-6.3 × 10⁴ J) = -6.2 × 10⁴ J

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Write the empirical formula of at least four binary ionic compounds that could be formed from the following ions:
maxonik [38]

Answer:

$ CaCl_2$, CaS, $ Cr Cl_4$, $ CrS_2$

Explanation:

The reaction can be done by adding the cations and the anions.

The binary compounds are always formed by the two different elements.

When one calcium ion, $ Ca ^{2+} $ combines with the two calcium ions, $ Cl^-$, they formed a binary compound of $ CaCl_2$.

When one $ Ca ^{2+} $ combines with one $S^{2-}$ ion, they formed CaS binary compound.

When one chromium ion $ Cr^{4+}$ combines with four ions of chlorine, $ Cl ^- $, the compound formed is $ Cr Cl_4$.

When 1 ion of $ Cr^{4+}$ combines with 2 ions of sulphur, $S^2$, the binary compound formed is $ CrS_2$.

7 0
3 years ago
HELPPPPPP!!!!!
Leokris [45]
Answer 1 is correct because 1 atm =10^5 so 1.25 atm will be equal to 1.25 *10 ^5
8 0
3 years ago
Read 2 more answers
One container of turns costs 4 dollars. Each container has eighty 1g tablets. Assume each turns is 40% caco₃. Using only turns,
stealth61 [152]

<u>Answer:</u> The cost is coming out to be $ 1.25

<u>Explanation:</u>

To calculate the number of moles for given molarity, we use the equation:

\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}

Molarity of HCl solution = 0.4 M

Volume of solution = 0.5 L

Putting values in equation 1, we get:

0.4M=\frac{\text{Moles of HCl}}{0.5L}\\\\\text{Moles of HCl}=(0.4mol/L\times 0.5L}=0.2mol

The chemical equation for the reaction of HCl and calcium carbonate follows:

CaCO_3+2HCl\rightarrow CaCl_2+H_2O+CO_2

By Stoichiometry of the reaction:

2 moles of HCl reacts with 1 mole of calcium carbonate

So, 0.2 moles of HCl will react with = \frac{1}{2}\times 0.2=0.1mol of calcium carbonate

To calculate the mass of calcium carbonate for given moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Molar mass of calcium carbonate = 100 g/mol

Moles of calcium carbonate = 0.1 moles

Putting values in equation 1, we get:

0.1mol=\frac{\text{Mass of calcium carbonate}}{100g/mol}\\\\\text{Mass of calcium carbonate}=(0.1mol\times 100g/mol)=10g

  • Calculating the mass of calcium carbonate in 1 container:

We are given:

One container contains eighty 1 g of tablets, this means that in total 80 g of tablets are there.

Every container has 40 % calcium carbonate.

Mass of calcium carbonate in 1 container = 40 % of 80 g = \frac{40}{100}\times 80=32g

  • Calculating the containers for amount of calcium carbonate that neutralized HCl by using unitary method:

32 grams of calcium carbonate is present in 1 container

So, 10 g of calcium carbonate will be present in = \frac{1}{32}\times 10=0.3125 container

  • Calculating the cost of turns:

1 container of turns costs $4

So, 0.3125 containers of turns will cost = \frac{\$ 4}{1}\times 0.3125=\$ 1.25

Hence, the cost is coming out to be $ 1.25

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3 years ago
Cars use ______ to reduce nitrogen oxide emissions.
kirza4 [7]
The answer is catalytic converters.
8 0
3 years ago
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