Determine the number of molecules of Cr.O. that form when 1.34 x 10 gof oxygen completely reacts according to the following equation: 4 Cr(s) + 3 O:(g) 2 Cr.O.(s) X. STARTING AMOUNT

Q: Calculate the number of hydrogen atoms in a 100.0 g sample of ammonia (NH,). Be sure your answer has…

A: One mole of any molecule contains approximatly 6.022 x 1023 (Avogadro's number) molecules. And the…

Q: A student measures the density of a solution to be 0.80 g/mL. The true density of the solution is…

A: Formula to calculate percent error is

Q: Please check my math 0.034 L = 0.000034 mL (enter only numerical value, no units) 0.034 X 0.001=…

A: Volume of the substance can be expressed in the units liter and milliliter. One litre (L) of a…

Q: A student determined that the mass of four pennies was 18.5grams. Use this information to calculate…

A:

Q: A sample of gold alloy has a mass of 9.3 kg. It is determined that 0.6 kg of the alloy is actually…

A: Answer:Mass percent of a substance can be calculated as:

Q: If you have 4.25 grams of Ag2O, how many moles of Ag2O do you have?

A: given: mass of Ag2O = 4.25 grams molar mass of Ag2O = 231.735 g/mol we need to calculate moles of…

Q: When answering this problem, report the answer with the appropriate number of significant figures.…

A: Given, in an experiment, amout of copper sample used =0.496 gramsand in the end of the…

Q: What is the difference between an exact number and an inexact number? Give an example of each type…

A: The arithmetic numbers can be categorized into two categories: exact and inexact numbers. These…

Q: coffee cup is found to have a volume of  263 mL. Using unit analysis, show what the volume of this…

A: By unit analysis we can conclude that, 1 L = 1000 ml         OR 1000 ml = 1L

Q: -23 An iron atom has a mass of 9.27 x 10 g and a cooking pot has a mass of 0.500 kg. Use this…

A: The mass of 1 atom of iron is 9.27 X 10-23 gThe mass of the cooking pot is 0.500 kg.To find the…

Q: g and a glass of water has a mass of 0.050 kg. An oxygen atom has a mass of 2.66 × 10 Use this…

A: Answer: Each mole of a specie has number of particles equal to Avogadro number whose value is equal…

Q: Calculate the mass of 0.11 moles of Cu(NO3)2. grams Give your answer to 2 decimal spaces.

A: Given that , No. Of moles of Cu(NO3)2 = 0.11 moles

Q: This was sent back.  It is a chemistry sig problem in freshman chemistry   Why is 1376 - (2.4x102)=…

A: No, there is no need to look at the last sig fig while adding or subtracting. There are certain…

Q: An aluminum atom has a mass of 4.48 × 10 g and a small airplane has a mass of 5000. kg. Use this…

A: Given, Mass of 1 atom of aluminium = 4.48 × 10-23 g Mass of small airplane = 5000 kg = 5.0 × 106 g…

Q: In Express your answer as an integer. N=                              Electrons    Ca Express your…

A: In Neutral atom, number of electrons are always equivalent to atomic number of that atom.

Q: A chemist prepares a solution of potassium chloride (KCl) by measuring out 0.60 g of KCl into a 100.…

A: Given Mass of KCl = 0.60 g Volume = 100 ml

Q: In a copper-plating experiment, the experimental amount of copper deposited is 3.0 grams. If the…

A: Use the percent error formula to calculate expected or theoretical amount of copper deposited to…

Q: Given the data below, calculate the mass of copper in the original sample. Mass of original sample…

A: Given that : Mass of original sample = 2.5429 g Mass of filter paper = 0.5662 g Mass of paper cup =…

Q: Calculate the mass of scheelite (CaWO,) that contains a billion (1.0 x 10) oxygen atoms. Be sure…

A: Number of oxygen atoms = 1.0 x 109 Molar mass of CaWO4 = 287.93 g/mol 1 mol = molar mass = 6.022 x…

Q: I am told that when determining the number of significant figures, if the decimal place is absent,…

A: Rules for Determination of Significant Figures:[i] All non-zero digits are significant.For example:…

Q: Use the data below to determine the mmoles of sodium oxalate to 2 decimal places. (MM sodium oxalate…

A: Given : mass of sodium oxalate = 0.093 g             MM of sodium oxalate = 134 g/mol  Tip : moles =…

Q: Solve this

A: Given- % abundance of 63Cu =  69.15 % % abundance of 65Cu =  30.85 % Atomic mass of  63Cu = 62.9300…

Q: Give detailed Solution with explanation needed...don't give Handwritten answer..don't use Ai for…

A: Hence, the correct answer is:Option 1: 5Explanation:Step 1:To determine the number of significant…

Q: The density of an unknown metal at room temperature, is 8.956 g/cm³. What is the density in pounds…

A: Density at room temperature (d) = 8.96 g/cm3Density can be calculated as -Density = mass / volume

Q: It is known that 1mL = 1cm³. What is the mass of a cube of gold (density = 19.32 g/cm³) if the…

A: Length of cube or side of gold = 2.00 cmdensity of gold = 19.32 g/cm3mass =?

Q: (Incorrect) A 56.20 g sample of a compound containing potassium, chromium, and oxygen is analyzed as…

A: Given : mass of sample = 56.20 g       Mass of potassium = 14.94 g  Mass of chromium = 19.87 g

Q: The Daily Value (DV) for chromium is 120mcg. Enter the equality for this statement. Express the mass…

A: The Daily Values (DV) are required nutrients for adults and children aged 4 or older. The trivalent…

Q: In 38.7 mL of water, a gold nugget weighing 523 g is inserted. The volume of the water increases to…

A:

Q: A student find an irregular metal object. Student wanted to know the identity of this metal. As a…

A: Metals are opaque, lustrous elements that are good conductors of heat and electricity. Most metals…

Q: The chemical formula for barium sulfide is baS. A chemist determined by measurements that 0.0700…

A: The chemical formula for barium sulfide is BaS. A chemist determined by measurements that 0.0700…

Q: The sum of  three numbers is 98. If the second number is 2/3 of the first and 8/5 of the third. Find…

A:

Q: In an experiment a student used a 50 mL volumetric flask to prepare her copper solution but in…

A: step 1:  For making standard solutions, one must take care of the quantity that is to be taken…

Q: What is the number of significant figures does the sum of the following contain   .3+ 5.652 , the…

A: 0.3+ 5.652

Q: D Question 4 Consider an object that is in the shape of a cube with a mass of 45.8 grams. If the…

A: Answer:Density of an object is the ratio of its mass and volume as shown below:Here:

Q: During the experiment, the mass of original sample was 2.226 g, and the mass of copper obtained was…

A: In the question, only two elements Copper (Cu) and Chlorine(Cl) are mentioned.So, we can conclude…

Q: Perform the calculation and record the answer with the correct number of significant figures.…

A: When addition or subtraction is carried out, the number that has a minimum number after the decimal…

Q: A hollow spherical iron ball has a diameter of 15.3 cm and has a mass of 13.5 kilograms. Assuming…

A: Given: Diameter of the outer sphere = 15.3 cm Mass of sphere = 13.5 Kg = 13500 g…

Q: What is the molar mass of alanine, C3H7NO2? • Write your answer using ONE decimal place, even if…

A: Given, Molar mass of Alanine, C3H7NO2 = ? Note:  Atomic mass of C = 12.01 g/mol Atomic mass of H =…

Q: Please answer this question as fast as you can please and tahnk you. I will afterwards write an…

A: The experimental density of a solution is -Trial 1 : 1.014 g/mLTrial 2 : 0.914 g/mLTrial 3 : 1.190…

Q: A 0.706 gram sample of copper is carried through the steps of this experiment. At the completion of…

A: Copper taken = 0.706 g  Copper recovered= 0.400 g

Q: The text tells you that, “1 trillion atoms could fit onto a period at the end of this sentence.”…

A: The number 1 trillion needs to be written using the correct number of zeros.

Q: How many significant figures would be in the answer to the problem 1.562-1.51?

A: The 0 in a number at last which has no decimal point is not considered significant. For example, 500…

Q: A 81.15 g sample of a compound containing potassium, chromium and oxygen is analyzed as containing…

A:

Q: So Why are counting words used instead of the numbers they represent?

A: Counting words like pairs, dozen, ream, or gross are used due to the below advantages or…

Q: Please don't providehandwrittin solution

A: To perform this calculation, first, subtract, then divide, and finally multiply. The final result is…

Q: electric current.

A:

Matter and Measurement

In the universe, there is matter, energy, and void space. The universe contains energy and void space. The definition of matter can be considered as something which possesses mass and consumes space. Chemistry is that branch of science which deals with the study of matter. Under chemistry, nature, composition, and the changes occurring to matter are discussed.