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Questions and Answers
What is the density of Au?
What is the density of Au?
- 19.33 g/cm^3
- 21.48 g/cm^3 (correct)
- 8.24 g/cm^3
- 1.24 g/cm^3
How many atoms of oxygen are present in 3.49 mols of Ca3(PO4)2?
How many atoms of oxygen are present in 3.49 mols of Ca3(PO4)2?
- 68 × 10^25 atoms
- 6.02 × 10^23 atoms
- 8.41 × 10^24 atoms
- 2.10 × 10^24 atoms (correct)
For a 500 mL volume of 154 mM NaCl solution, how many grams of NaCl must be added?
For a 500 mL volume of 154 mM NaCl solution, how many grams of NaCl must be added?
- 418.9 g (correct)
- 77.0 g
- 8.42 g
- 4.50 g
What should the coefficient in front of $H_2O$ be in the balanced equation: $B_2H_6 (g) + O_2 → HBO_2 (g) + H_2O (l)$?
What should the coefficient in front of $H_2O$ be in the balanced equation: $B_2H_6 (g) + O_2 → HBO_2 (g) + H_2O (l)$?
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Convert the number $1.84 × 10^{-5}$ from scientific notation to standard notation.
Convert the number $1.84 × 10^{-5}$ from scientific notation to standard notation.
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Study Notes
Density of Gold (Au)
- The density of gold is a physical property that describes the mass of a substance per unit volume.
Atoms of Oxygen in Calcium Phosphate
- The formula for calcium phosphate is $Ca_3(PO_4)_2$.
- There are 8 atoms of oxygen in one molecule of calcium phosphate.
- 3.49 mols of $Ca_3(PO_4)_2$ contains 27.92 moles of oxygen atoms.
- The number of atoms in 27.92 mols of oxygen is $1.68 × 10^{25}$ atoms.
NaCl Solution Preparation
- The molar mass of NaCl is 58.44 g/mol.
- 154 mM NaCl solution represents 0.154 mol/L NaCl.
- 500 mL solution is 0.5 L.
- The number of grams of NaCl needed is 4.51 g
Balancing Chemical Equation
- The balanced chemical equation is $B_2H_6 (g) + 3O_2 → 2HBO_2 (g) + 3H_2O (l)$.
- The coefficient in front of $H_2O$ is 3.
Scientific Notation Conversion
- $1.84 × 10^{-5}$ is equivalent to 0.0000184.
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