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A sample ore is found to be 0.0015% gold and 0.0034% copper. What is the percentage of matter in the ore that is neither gold nor copper? Round your answer to the nearest ten thousandth
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- Which of these statements are qualitative? Which are quantitative? Explain your choice in each case. (a) Sodium is a silvery-white metal. (b) Aluminum melts at 660 C. (c) Carbon makes up about 23% of the human body by mass. (d) Pure carbon occurs in different forms: graphite, diamond, and fullerenes.Determine the elemental percentages of all elements in C7H12CuO2. Enter your answer to two decimal places of precision, but do not include the percentage sign in your answer. C = H = Cu = O= % % % %A compound contains only Mn and F. The ratio of Mn and F is 1.73 moles of F per 1 mole of Mn. If the empirical formula is expressed as MnFx, what is the numerical value for x? If the formula is MnF5, you would enter the number 5. Please enter a whole number (i.e. round the number to the nearest whole number) and DO NOT include any units.
- How many formula units are in 30.912 g of potassium permanganate? Give answer to the correct number of significant figures. If exponents are needed, use the format 1.23E+4. Do not include unit or substance for this answer.The weight percent of silicon in six different rock samples, each containing different amounts of silicon, was measured by two different methods. The results are given in the table. Sample Method A Si wt% | Method B Si wt% 1 11.570 11.540 2 15.380 15.290 3 17.950 17.820 4 22.840 22.810 25.110 25.150 6 27.070 27.020 Determine tcalc.Percentage Abundance. The element rubidium consists of two isotopes, one having an isotopic mass of 84.912 and the other having an isotopic mass of 86.920. Determine the percentage abundance of the lighter isotope. Record the answer to the correct number of significant figures. Show the numerical set-ups. Include units and the correct number of significant figures in the set-up.
- 1. The molecular formula for potassium hydrogen phthalate (abbreviated KHP) is C3H$O4K. What is the molar mass of KHP? Show all work with no rounding errors and have the final answer accurate to at least two decimal places.How many grams F in 650.1 g Br2F6? Put the answer in the box in regular (non-scientific) notation. Use one figure past the decimal.calculate the quantities needed to prepare the solid and semisolid compounds. Round your answers to two decimal places (hundredths) when necessary. Calculate the amount of Vaseline ® needed to prepare 1.5 oz. of 15% salicylic acid ointment.
- What is the mass of 2.38 moles of AgNO 3 ^ prime ? Write your answer to 2 decimal places and include the unit .Calculate the mass percent of C3H5OCO2H3 in the sample. Be sure your answer has the correct number of significant digits.An alloy contains 10.8 % titanium by mass and has a density of 13.98 g/cm3. Titanium-49 has an isotopic abundance 6.82 %. Calculate the volume (cm3) of alloy required that contains 8,926,980,280,926,177,000,000 atoms of titanium-49. Submit your answer with no units and to two decimal places.