Chapter 2: Problem 92
Identify the element represented by each of the following symbols and give the number of protons and neutrons in each: $(\mathbf{a})_{5}^{11} X(\mathbf{b})_{33}^{75} X(\mathbf{c})_{36}^{86} X(\mathbf{d}) \frac{67}{30} X$.
Chapter 2: Problem 92
Identify the element represented by each of the following symbols and give the number of protons and neutrons in each: $(\mathbf{a})_{5}^{11} X(\mathbf{b})_{33}^{75} X(\mathbf{c})_{36}^{86} X(\mathbf{d}) \frac{67}{30} X$.
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Sodium reacts with oxygen in air to form two compounds: sodium oxide and sodium peroxide. In forming sodium oxide, \(23.0 \mathrm{~g}\) of sodium combines with \(8.0 \mathrm{~g}\) of hydrogen. In forming sodium peroxide, $23.0 \mathrm{~g}\( of sodium combines with \)16.0 \mathrm{~g}$ of oxygen. (a) What are the mass ratios of oxygen in the two compounds? (b) What fundamental law does this experiment demonstrate?
One way in which Earth's evolution as a planet can be understood is by measuring the amounts of certain isotopes in rocks. One quantity recently measured is the ratio of \({ }^{129} \mathrm{Xe}\) to \({ }^{130}\) Xe in some minerals. In what way do these two isotopes differ from one another? In what respects are they the same?
Consider the following organic substances: ethylethanoate, ethylmethylether, hexanol, and propanone. (a) Which of these molecules contains three carbons? (b) Which of these molecules contain a \(\mathrm{C}=\) O group?
(a) What isotope is used as the standard in establishing the atomic mass scale? (b) The atomic weight of boron is reported as \(10.81,\) yet no atom of boron has the mass of \(10.81 \mathrm{u}\). Explain.
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