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Questions and Answers
What is the density of Au?
What is the density of Au?
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?
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?
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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Description
Test your knowledge of density and measurement conversions with this quiz. From Archimedes' famous experiment to laboratory measurements, challenge yourself with questions about the density of materials and calculations involving volume and mass.
