A4.000 g sample of iron was heated from 0.0°c to 21.0°c. if it has a specific heat of 0.440 kj/kg °c, how many kilojoules of heat does it absorb?
Solved
Show answers
More tips
- O Other Everything You Need to Know About Kudyabliks...
- C Computers and Internet The Twitter Phenomenon: What it is and How to Use it...
- C Computers and Internet How to Choose a Laptop: Expert Guide and Tips...
- C Computers and Internet How to Choose a Monitor?...
- H Horoscopes, Magic, Divination Where Did Tarot Cards Come From?...
- S Style and Beauty How to Make Your Lips Fuller? Ideas and Tips for Beautiful Lips...
- C Computers and Internet How to Learn to Type Fast?...
- A Art and Culture Who Said The Less We Love a Woman, the More She Likes Us ?...
- F Family and Home How to Get Rid of Your Neighbors?...
Answers on questions: Chemistry
- C Chemistry The major reaction of the unsaturated compounds is:...
- C Chemistry The molar mass of a solid carboxylic acid is determined by titrating a known mass of the acid with a standardized solution of naoh to a phenolphthalein endpoint....
- C Chemistry A0.3000-g sample of soda ash (which contains sodium carbonate) is dissolved in 50.00 ml of water. titration with standard 0.1000 m hcl required 42.70 ml of the acid...
- C Chemistry A1.00 g sample of a hydrogen peroxide (h2o2) solution is placed in an erlenmeyer flask and diluted with 20 ml of 1 m aqueous sulfuric acid. to this solution is added...
- C Chemistry Toluene, c7h8, has both a higher vapor pressure than water at 25 ã‚åÿc and a higher normal boiling point. which statement best explains these observations? (a) liquids...
- C Chemistry Which statement describes the charge distribution and the polarity of a ch4 molecule? the charge distribution is symmetrical and the molecule is nonpolar.the charge...
- C Chemistry Which of the following statements provides the best explanation for the many chemical similarities between two elements in a main group? (note: only one answer (a)...
- C Chemistry Acetylcholine binds to its receptor in the sarcolemma and triggers a. the opening of voltage-gated calcium channels b. the opening of ligand-gated cation channels...
- C Chemistry A container holds 500 mL of oxygen gas at a pressure of 1.3 atm and a temperature of 25 ˚C. If the temperature increases to 29 ˚C and the pressure increases to 2.0...
- C Chemistry 0.415-g of potassium hydrogen phthalate are dissolved in water and phenolphthalein indicator added. The equivalence point is reached with the addition of 31.95-mL...
Ответ:
Q = mc(θ₂ - θ₁)
Q = 0.004*0.440*(21 - 0)
Q = 0.03696 kJ
0.03696 kJ of heat is absorbed.
Ответ:
NiCl₂·4H₂O, its name being nickel (II) chloride tetrahydrate.
Explanation:
The constant mass achieved after heating is the mass of anhydrous nickel (II) chloride, NiCl₂. While the mass lost was water.
Mass lost = 1.167 g - 0.750 g = 0.417 gNow we convert 0.750 g of NiCl₂ into moles, using its molar mass:
0.750 g NiCl₂ ÷ 129.6 g/mol = 0.0058 mol NiCl₂Then we convert 0.417 g of H₂O into moles:
0.417 g H₂O ÷ 18 g/mol = 0.0231 mol H₂OWith the above information we can calculate that the number of H₂O moles is 4 times higher than the number of NiCl₂ moles.
Meaning that the formula of the hydrate is NiCl₂·4H₂O, its name being nickel (II) chloride tetrahydrate.