How many grams of Mg is needed to create 762.44 mL of H2 gas at 39.86oC and  614 mmHg according to the reaction below.

Mercury can be obtained by reacting mercury(II) sulfide with calcium oxide. How many grams of calcium oxide are needed to produce 36.0 g of Hg?4HgS(s) + 4CaO(s) ® 4Hg(l) + 3CaS(s) + CaSO4Group of answer choices13.4g7.56g10.1g1.80g

In the lab, a student collects hydrogen gas over water in a gas measuring tube. The hydrogen gas is produced when a piece of magnesium metal reacts with excess hydrochloric acid. What is the mass in grams of hydrogen gas collected if 2.49 g of magnesium metal is consumed in the reaction?The molar mass of Mg is 24.305 g/mol. The molar mass of H2 is 2.016 g/mol.

Considering this balanced chemical equation, how many grams of HgO will be produced when 44 g of Hg react with excess O2?2Hg (l) + O2 (g)→ 2HgO (s) Group of answer choices48 g96 g44 g28 g

If 9.21 L of CH4 undergoes complete combustion at 73.04 mm Hg and 37.15ºC, how many grams of H2O is formed?CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)

can react with H2 to form the compound N2H4.(e) A sample of N2H4 has a mass of 25g. Identify the numerical quantity that is needed to convert the number of grams of N2H4 to the number of moles of N2H4. (You do not need to do the actual calculation.)