I have these 10 questions that I got the answer wrong and I need some help.

I write down each question my answer and it was not correct and that for your information if you got the same my answer it will not correct.

1) An excavator is preparing to dig a basement for a new house. Part of his contractreads that he must dispose of all the dirt he removes while digging the basementin an EPA approved landfill. He will dig a hole that is 40.0 feet wide by 80.0 feetlong and 7.5 feet deep. He first uses his shovel and scoops up 1.00 kg of dirt, andthen determines that the dirt has a volume of 600 cm3. The excavator knows thathis dump truck can only carry 8,000 kg of dirt. How many dump-truck loads willit take to haul the dirt away?

(1 in = 2.54 cm) ________ dump-truck loads

My answer: 88.49 not correct

2) Phosphorus reacts with iodine as shown in the chemical reac on below. What isthe percent yield of the reac on if 42.33g PI3 is obtained from the reac on of48.0 g of I2 with excess phosphorus?

2P(s) + 3I2(s) → 2PI3(s)_____% Yield

My answer: 92.49% not correct

3) Determine the oxidation number of each of the element P in H2PO3-?

My answer: +3 not correct

4) The residential rate for natural gas is about $15 per thousand cubic foot. Burningone cubic foot of natural gas releases about 1080 kJ of heat. How much would itcost to heat the water in a 25,000 gallon swimming pool from 52°F to 78°F,assuming all of the heat from burning the natural gas went towards warming thewater? (1 gal = 3.785 L; the specific heat of water = 4.184 J/g·°C) $

My answer: $3.18 not correct

5) When an automobile engine starts, the metal parts immediately begin to absorbheat released during the combus on of gasoline. How much heat will beabsorbed by a 165 kg iron engine block as the temperature rises from 15.7°C to95.7°C? (The specific heat of iron is 0.489 J/g·°C.) _____kJ

My answer: 6,450 not correct

6) At body temperature 2,404 joules of energy are required to evaporate 1.00 g ofwater. A er vigorous exercise, a person feels chilly because the body is giving upheat to evaporate the perspira on. A typical person perspires 25 mL of watera er 20. minutes of exercise. How much body heat is this person using toevaporate this water? ______kJ

My answer: 60.1 not correct

7) On a spring morning (15.°C) you fill your res to a pressure of 32psiatmospheres. As you ride along, the re heats up to 45°C from the friction on theroad. What is the pressure in your res now in units of atmospheres?_______atm

My answer: 2.4 not correct

8) Ammonium nitrite undergoes decomposi on to produce only gases as shownbelow.

NH4NO2(s) → N2(g) + 2H2O(g)
How many liters of gas will be produced by the decompositon of 32.0 g ofNH4NO2 at 525°C and 1.5 atm? ________ L (N2 + H2O)

My answer: 21.84 not correct

9) In an effort to address concerns about global warming, a power plant inPortland,Oregon is designed to take all of its exhaust gases from its boilers andrecycle the CO2 using the Solvay process to make sodium hydrogen carbonate.The reac on is shown below.

NH3(g) + H2O(l) + CO2(g) + NaCl(aq) → NaHCO3(aq) + NH4Cl(aq)
How many liters each of NH3 and CO2 (both at STP) would be consumed toproduce 6.00 kg of sodium bicarbonate?
The volume of both NH3 and CO2 would be ______liters

My answer: 800 not correct

10) Baking powder is made up of sodium hydrogen carbonate and calcium hydrogenphosphate. When baking powder is wet, these components react to produce carbon dioxide. The equation for this reaction is given below.

NaHCO3(aq) + CaHPO4(aq) → NaCaPO4(aq) + CO2(g) + H2O(l)

Assuming all of the carbon dioxide was released as a gas, how many liters ofCO2(g) would be formed at room temperature from 4.00 g of NaHCO3 and excessCaHPO4?
Approximately _____liters

My answer: 1.07 not correct