Which of the following chemical equations is balanced?2 Al + 2 CuO ----> A1,0, + 2 Cu
Fe, 0, + 3C --> 2Fe + 3 CO,
2 SO, + 02 S0, + 0, ---> 2 SO,
2 Ag,0 ----> 2 Ag + O2> 02

Answers

Answer 1

Answer:

Answer:

the last one is the answer

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A mothball, composed of naphthalene (C10H8), has a mass of 1.52g. How many naphthalene molecules does it contain?

Answers

The molar mass of naphthalene is calculated as follows,
10 x (12.01 g/ mol) + 8 x (1.01 g/mol) = 128.12 g/mol
Divide the given mass by the molar mass to determine the number of moles of naphthalene present in the ball.
n = 1.52 g / 128.12 g/mol = 0.01186 mole
Multiply the number of moles to number of moles per mole.
(0.01186 mol) x (6.022 x10^23 molecules / mole) = 7.14 x 10^21 molecules

Muscles perform what type of energy transformation?

Answers

Muscles perform energy transformation from chemical energy to kinetic energy which is very evident as we do our day to day activities. Hope this answers the question. Have a nice day. Feel free to ask more questions. Thank you.

Help please! How many significant figures are in the measurement 0.00440 grams?

6
5
3
2

Answers

3 significant figures.

In which pair would both compounds have the same empirical formula? A. H2O and H2O2 B. BaSO4 and BaSO3 C. FeO and Fe2O3 D. C6H12O6 and HC2H3O2

Answers

The pair of both compounds that have the same empirical formula are C6H12O6 and HC2H3O2. The answer is letter D. H2O and H2O2, BaSO4 and BaSO3 and FeO and Fe2O3 do not have the same empirical formula.

The surface temperature on Venus may approach 737 K. What is this temperature in degrees Celsius?The temperature on Mercury may drop to –265 °F at night. What is this temperature in degrees Celsius?

Answers

Answer:

i) 737 K = 463.85 °C

ii) -265 °F = -165 °C

Solution:

Converting 737 K into °C :

As we know Absolute zero (0K) is equivalent to -273. 15 °C. Hence,

K = °C + 273.15

Or,

°C = K - 273.15

Putting value of K,

°C = 737 - 273.15

°C = 463.85 °C

Converting -265 °F into °C :

As,

°F = °C × 1.8 + 32

So,

°C = °F - 32 ÷ 1.8

Putting value of °F,

°C = -265 - 32 ÷ 1.8

°C = -165 °C

To convert K to C subtract 273.15.

739K-273.15C= 465.85 C or approximately 466C

To convert F to C multiply by 1.8 and add 32.

so the answer is approximately -167 degrees celcius

What is another term used for a "base"