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Olenka [21]
2 years ago
8

A lead mass is heated and placed in a foam cup caloriemeter containing 40.0mL of water at 17.0 C. The water reaches a temperatur

e of 20.0 C. How many joules of heat were released by the lead?​
Chemistry
1 answer:
Mrrafil [7]2 years ago
8 0

the Answer is             502 Joules

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What body part is the metric system based upon? <br> legs <br> arms <br> fingers<br> feet
8_murik_8 [283]

Answer:

arms

Explanation:

because arms can be metric system of our body

3 0
2 years ago
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How many moles of NH3 can be produced by the reaction of 2.00 g of N2 with 3.00 g H2?
yulyashka [42]
0.235 if I’m not mistaken!
8 0
2 years ago
What is the solution to the problem expressed to the correct number of significant figures 102900/12 +170•1.27
Morgarella [4.7K]

The solution to the problem (102 900 ÷ 12) + (170 × 1.27) = 8800.

<u>Explanation</u>:

Step 1.

Evaluate the expressions inside the parentheses (PEMDAS)

102 900 ÷ 12 = 8575

170 × 1.27 = 215.9

In multiplication and division problems, your answer can have no more significant figures than the number with the fewest significant figures.

Thus, the underlined digits are not significant, but we keep them in our calculator to avoid roundoff error.

Step 2.

Do the addition (PEMDAS).

8575 + 215.9 = 8790.9

Everything that you add to an insignificant digit gives an insignificant digit as an answer.

Thus, the underlined digits are not significant.

We must drop them and round up the answer to 8800.

4 0
3 years ago
Read 2 more answers
354.4 g of chlorine gas (MW=70.9g/mol) is held in a vessel with a fixed volume of 70.0 L. What is the pressure of the gas in atm
Katarina [22]

Explanation:P = 1.73atm

mole(n) = mass in grams/ molecular weight

n = 354.4/ 70.9

n=4.8717mol

From PV =nRT

P=nRT/V

P= 4.8717×0.0821×303/70

P=1.73atm

4 0
3 years ago
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How many molecules of N2O4 are in 76.3g N2O4? The molar mass of N2O4 is 92.02 g/mol.
Murrr4er [49]

Answer:

4.99*10²³ molecules of N₂O₄ are in 76.3 g of N₂O₄

Explanation:

Avogadro's Number is the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023*10²³ particles per mole. Avogadro's number represents a quantity without an associated physical dimension. Avogadro's number applies to any substance.

You know that the molar mass of N₂O₄ is 92.02 g/mol, and you have 76.3 g. Then you can apply the following rule of three: 92.02 grams are present in 1 mole of the compound, 76.3 grams in how many moles are they?

amount of moles= \frac{76.3 grams*1 mole}{92.02 grams}

amount of moles= 0.83 moles

Then, you can apply another rule of three: if by definition of Avogadro's number 1 mole of the compound has 6.023*10²³ molecules, 0.83 moles of the compound, how many molecules will it have?

amount of molecules= \frac{0.83 moles*6.023*10^{23}molecules }{1 mole}

amount of molecules= 4.99*10²³

<u><em>4.99*10²³ molecules of N₂O₄ are in 76.3 g of N₂O₄</em></u>

6 0
3 years ago
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