1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
goldenfox [79]
3 years ago
13

. If the combustion of 45.0 g of methane (natural gas) releases 2498 kJ of heat energy, how much heat

Chemistry
2 answers:
Amanda [17]3 years ago
6 0

Answer:

8.60 x 10⁴ kJ

Explanation:

The energy released per gram of methane is first calculated:

(2498kJ)/(45.0g) = 55.5 kJ/g

The heat released by the combustion of 1.55 kg of methane is then calculated:

(55.5kJ/g)(1.55kg)(1000g/kg) = 86025kJ

To three significant digits, the answer is 8.60 x 10⁴ kJ.

blondinia [14]3 years ago
5 0
45g ---> 2498kJ
1.55g ----> ?kJ
 Answer: (1.55x2498)/45 approx 86.04 (kJ)

You might be interested in
Heroin was originally going to be called "wunderlich", a German word for wonderful, since one chemist thought the substance made
Zarrin [17]

Answer:

heroic

Explanation:

Bayer, a German pharmaceutical company, named the substance it synthesized "heroin", probably from the word heroisch, German for heroic, because in field studies people using the medicine felt "heroic".

BTW, I found this information on this wedsite: https://www.answers.com/Q/Where_did_heroin_get_its_name

Also, if you want some more history about this drug, you can visit this article: https://www.narconon.org/drug-information/heroin-history.html

5 0
3 years ago
What do we call the study of matter and how matter changes?
svet-max [94.6K]

Answer:

Explanation:

Chemistry is the study of matter and the changes that matter undergoes. Matter is anything that has mass and takes up space.

7 0
3 years ago
Iridium has two naturally occurring isotopes, Iridium-191 and Iridium-193. If the average atomic mass of orodum s 192.217, what
Lina20 [59]

Answer:

The percent isotopic abundance of Ir-193 is 60.85 %

The percent isotopic abundance of Ir-191 is 39.15 %

Explanation:

we know there are two naturally occurring isotopes of iridium, Ir-191 and Ir-193

First of all we will set the fraction for both isotopes

X for the isotopes having mass 193

1-x for isotopes having mass 191

The average atomic mass is 192.217

we will use the following equation,

193x + 191(1-x) = 192.217

193x + 191 - 191x = 192.217

193x- 191x = 192.217 - 191

2x = 1.217

x= 1.217/2

x= 0.6085

0.6085 × 100 = 60.85 %

60.85% is abundance of Ir-193 because we solve the fraction x.

now we will calculate the abundance of Ir-191.

(1-x)

1-0.6085 =0.3915

0.3915× 100= 39.15 %

6 0
3 years ago
Which compound contains both ionic and covalent bonds? 1.  ki 2.  cacl2 3.  ch2br2 4.  nacn?
Savatey [412]
<span>NaCn contains an Na+ ion and a CN- negative ion, so it has an ionic bond. The CN ion is formed by a covalent bond of the carbon and nitrogen, so it also has a covalent bond. Therefore, the answer is NaCN.</span>
4 0
3 years ago
Read 2 more answers
If you have 23.8g of CaCl2, how many formula units is it?
NemiM [27]

Answer:

1.3×10²³ formula unit

Explanation:

Given data:

Mass of CaCl₂ = 23.8 g

Number of formula unit = ?

Solution:

Number of moles = mass/molar mass

Number of moles = 23.8 g/110.98 g/mol

Number of moles = 0.21 mol

1 mole of any substance contain 6.022×10²³ formula unit

0.21 mol × 6.022×10²³ formula unit / 1mol

1.3×10²³ formula unit

8 0
3 years ago
Other questions:
  • What is the potential energy of the reactants from the following energy diagram?
    11·2 answers
  • Which of the following pieces of information about the element lithium describes the atomic number only
    11·1 answer
  • Given the particle diagram:. At 101.3 kPa and 298 K, which element could this diagram represent?. 1. Rn 3. Ag. 2. Xe 4. Kr
    15·2 answers
  • How would you describe the outer electrons of the silver atoms
    8·2 answers
  • Why is strontium more reactive than calcium but less reactive than rubidium?
    15·1 answer
  • Which of the following is not equal to 325 cg?
    14·2 answers
  • Which kind of atoms would typically form an ionic bond?
    5·1 answer
  • Given the chemical equation: 2 Pb + O2 → 2 PbO, if 51.8 grams of Pb are formed in this reaction, then 8.00 grams of O2 must have
    12·1 answer
  • which of the following substances diffuses faster in a beaker filled with water  a drop of honey or drop of red ink
    12·2 answers
  • Which choice correctly describes the subatomic particles in the isotope 44ca?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!