Calculate the number of atoms of hydrogen (H) in 323 cm3 of the colorless gas ethylene at 0 °C and atmospheric pressure, where its density is 1.25×10-3 g cm-3. The molecular formula of ethylene is C2H4.

Give the number of atoms of the specified element in a formula unit of each of the following compounds, and calculate the molecular (formula) mass:(a) Hydrogen in ammonium benzoate, C6H5COONH4(b) Nitrogen in hydrazinium sulfate, N2H6SO4(c) Oxygen in the mineral leadhillite, Pb4SO4(CO3)2(OH)2

Which of the following are methods of calculating molecular properties? Which of the following are methods of calculating molecular properties? balls on a string molecular mechanics semi-empirical ab initio

Which of the following setups would you use to obtain the number of O atoms in 86.8g of Cr(NO3)3?

Give the empirical formula for decaborane, whose molecularformula is B10H14.

What do the formula H2O and H2O2 tell about composition? Are they the same compounds? Justify your answer.

Write the balanced equation for the photosynthesis reaction in which gaseous carbon dioxide and liquid water react in the presence of chlorophyll to produce aqueous glucose (C6H12O6) and oxygen gas.

Give the number of atoms of the specified element in aformula unit of each of the following compounds, and calculatethe molecular (formula) mass:(a) Hydrogen in ammonium benzoate, C₆H₅COONH₄(b) Nitrogen in hydrazinium sulfate, N₂H₆SO₄(c) Oxygen in the mineral leadhillite, Pb₄SO₄(CO₃)₂(OH)₂

The compound As2I4 is synthesized by reaction of arsenic metal with arsenic triiodide. If a solidcubic block of arsenic (d = 5.72 g/cm3) that is 3.00 cm on edge is allowed to react with 1.01 x 1024molecules of arsenic triiodide, what mass of As2I4 can be prepared? If the percent yield of As2I4 was75.6%, what mass of As2I4 was actually isolated?

What would be the mass, in grams, of an NO2 sample in which 100 billion (1.00 X 10 11) moleculesare present?