9. The average mass of a gold atom is 196.97 u. a) What is the mass...
2) A gold necklace contains 0.54 mol of gold. What is its mass in grams? 3) A helium balloon contains 0.56g of He. How many moles of He does it contain? 4) How many Na atoms in 255 g of Na3PO4? 5) Calculate the mass in grams of 6.4 x 102 NO: molecules 6) Determine the number of atoms of O in 84.0 g of CsH1005
What is the mass, in grams, of 9.10 x 1024 molecules of methanol (CH3OH) ? mass: What is the mass of exactly 1 mole of each of the elements? arsenic: boron: germanium: Tia has a sample of pure gold (Au). She weighed the sample and the result was 45.2 grams. Tia wants to determine the number of atoms in the sample. Calculate the number of atoms in 45.2 g of pure gold.
Gold has a molar mass of 197 g/mol. (a) How many moles of gold are in a 9.45 g sample of pure gold? (b) How many atoms are in the sample?
Gold has a molar mass of 197 g/mol. (a) How many moles of gold are in a 1.67 g sample of pure gold? (b) How many atoms are in the sample?
1.According to the periodic table, a single (1 exactly) carbon atom has a mass of 12.011 amu. What is the mass of a single carbon atom in grams? 2. How many carbon atoms does it take to equal 12.011 grams? Complete the dimensional analysis set up provided for you (Hint: Your answer to question 1 can help answer this question). (Round to 3 sig figs) 3. According to the periodic table, a single phosphorus atom has a mass of 30.973...
Tia has a sample of pure gold (Au). She weighed the sample and the result was 52.9 grams. Tia wants to determine the number of atoms in the sample. Calculate the number of atoms in 52.9 g of pure gold. Au atoms
Tia has a sample of pure gold (Au). She weighed the sample and the result was 61.1 grams. Tia wants to determine the number of atoms in the sample. Calculate the number of atoms in 61.1 g of pure gold.
Tia has a sample of pure gold (Au). She weighed the sample and the result was 73.9 grams. Tia wants to determine the number of atoms in the sample. Calculate the number of atoms in 73.9 g of pure gold.
An atom of bromine has a mass about four times greater than that of an atom of neon. How many grams of neon will contain the same number of atoms as 1,000 g of bromine? An atom of bromine has a mass about four times greater than that of an atom of neon. Which choice makes the correct comparison of the relative numbers of bromine and neon atoms in 1,000 g of each element?
A. How many moles of silicon dioxide, SiO2 , are present in a sample that contains 3.61 moles of oxygen atoms? B. How many moles of oxygen atoms are present in a sample that contains 2.95 moles of SiO2 ? C. How many moles of sulfur atoms are present in a sample that contains 1.92 moles of disulfur decafluoride, S2F10 ? D.How many moles of S2F10 molecules are present in a sample that contains 6.13 moles of sulfur atoms? E....