How many grams of hydrochloric acid, HCl, are needed to react with excess aluminum to produce 2.7 moles of aluminum chloride? ___Al(s) + ___HCl(aq) → ___H2(g) + ___AlCl3(aq)

The volume of an unknown substance in a sealed glass jar is 50 milliliters. the volume of the jar is 200 milliliters. which state of matter could the substance be?

Calculate the standard enthalpy of formation of liquid methanol, ch3oh(l), using the following information: c(graphite) + o2 latex: \longrightarrow ⟶ co2(g) latex: \delta δ h° = –393.5 kj/mol h2(g) + o2 latex: \longrightarrow ⟶ h2o(l) latex: \delta δ h° = –285.8 kj/mol ch3oh(l) + o2(g) latex: \longrightarrow ⟶ co2(g) + 2h2o(l) latex: \delta δ h° = –726.4 kj/mol

Comparing john newland’s octaves with the modern periodic table, which 5 elements have been discovered between hydrogen and iron since newland’s time?