Questions from General Chemistry

Q: Using the average atomic masses given in Table 8.1,

Using the average atomic masses given in Table 8.1, calculate the number of atoms present in each of the following samples. a. 160,000 amu of oxygen b. 8139.81 amu of nitrogen c. 13,490 amu of alum...

Q: If an average sodium atom weighs 22.99 amu, how

If an average sodium atom weighs 22.99 amu, how many sodium atoms are contained in 1.98 * 1013 amu of sodium? What will 3.01 * 1023 sodium atoms weigh?

Q: If sodium peroxide is added to water, elemental oxygen gas is

If sodium peroxide is added to water, elemental oxygen gas is generated: Na2O2(s) + H2O(l) NaOH(aq) + O2(g) Suppose 3.25 g of sodium peroxide is added to a large excess of water. Wha...

Q: Before going to lab, a student read in his lab manual

Before going to lab, a student read in his lab manual that the percent yield for a difficult reaction to be studied was likely to be only 40. % of the theoretical yield. The student’s prelab stoichiom...

Q: Consider the following unbalanced chemical equation for the combustion of pentane (

Consider the following unbalanced chemical equation for the combustion of pentane (C5H12): C5H12(l) + O2(g) CO2(g) + H2O(l) If a 20.4-gram sample of pentane is burned in...

Q: A 0.4230-g sample of impure sodium nitrate (

A 0.4230-g sample of impure sodium nitrate (contains sodium nitrate plus inert ingredients) was heated, converting all the sodium nitrate to 0.2339 g of sodium nitrite and oxygen gas. Determine the pe...

Q: Calculate the mass in grams of each of the following samples.

Calculate the mass in grams of each of the following samples. a. 0.994 mole of benzene, C6H6 b. 4.21 moles of calcium hydride c. 1.79 * 10-4 moles of hydrogen peroxide, H2O2 d. 1.22 mmol of glucos...

Q: Consider the following unbalanced chemical equation. LiOH(s)

Consider the following unbalanced chemical equation. LiOH(s) + CO2(g) / Li2CO3(s) + H2O(l) If 67.4 g of lithium hydroxide reacts with excess carbon dioxide, what mass of lithium carbonate will be pro...

Q: Consider the following unbalanced chemical equation: H2S(g)

Consider the following unbalanced chemical equation: H2S(g) + O2(g) SO2(g) + H2O(g) Determine the maximum number of moles of SO2 produced from 8.0 moles of H2S and 3.0 moles...

Q: What do we mean by thermodynamics? What is the first law

What do we mean by thermodynamics? What is the first law of thermodynamics?