Question

5. How many moles contain 96 g of oxygen 02?
6. Find the amount of the substance in 24.5 g of sulfuric acid H2Sedla.
7. Calculate the mass of 0.1 mol of phosphoric acid H3PO4.
8. Calculate the mass of 2.5 mol of calcium phosphate Ca (P2.
9. Onpe e Determine the amount of the substance that is contained in 51 gof hydrogen sulfide onopon-
Benoic acid H2S.S
10. Find the mass of 3 mol of zinc carbonate ZnCO3.
1 11. Find the mass of chlorine in 3 moles of calcium chloride CaCl2
12 12 Where are the more molecules contained in 1 of the NH3 gammiac or in the N2 gas?
1 13. Calculate the mass of ten molecules of nitric acid HNO3.
1414. Find the molar mass of a substance if the mass of one molecule is
5,31-1023 g.
1 15. Find the molar mass of a substance if the mass of five molecules is
a
8,14-10"g.
1 16. Find the mass of four molecules of carbonic acid H2CO3.
17 17. Determine the molar mass of a substance if the mass of seven molecules is equal to​

Answer 1

Answer:

5.molecular weight of O2 or mol The SI base unit for amount of substance is the mole. 1 grams O2 is equal to 0.031251171918947 mole.

6.of H₂SO₄ are present in 25 grams of H₂SO₄.

7.molecule of the compound H3PO4 contains three hydrogen atoms, one phosphorus atom, and four oxygen atoms. The molar mass is obtained by adding up the average atomic masses of these atoms: Molar mass H3PO4 = 3(1.008 g) + 1(30.97 g) + 4(16.00 g) = 97.99 g.

8.Ca3(PO4)2 = 3 Ca + 2 P + 8 O • Molar mass of Ca3(PO4)2 = • (3 x 40.08) + (2 x 30.97) + (8 x 16.00) = • 120.24 + 61.94 + 128.00 = • 310.18 g/mol or • 1 mol Ca3(PO4)2 = 310.18 g Ca3(PO4)2 • Example: Calculating Grams from Moles for Compounds • A student has worked out the details for an experiment that will use 0.115 mol ...