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Note:
1 mole of a compound is equivalent to its molecular mass
1 mole of a compound is equal to 6.02x10^23 molecules
The percentage is a direct equivalent to grams
Answers should be in 3 significant figures
No need to include the units and the compound in the answers
- Determine the molecular formula of a compound with an empirical formula of NH2 and a formula mass of 32.06 u.
- A sample of a compound with a formula mass of 34.00 u is found to consist of 0.44 g H and 6.92 g O. Find its molecular formula.
- What is the percent yield if 34.5 g of calcium hydroxide is produced when 37.6 g Calcium oxide reacts with 100 g of water in this balanced equation?
NOTE :
1 mole of a compound is equivalent to its molecular mass
1 mole of a compound is equal to 6.02x10^23 molecules
The percentage is a direct equivalent to grams
Answers should be in 3 significant figures
No need to include the units and compound in the answers
- A compound is found to contain 63.52 % iron and 36.48% sulfur. Find its empirical formula.
- A compound is found to contain 26.56% potassium, 35.41% chromium, and the remainder oxygen. Find its empirical formula.
- A 60.00 g sample of tetraethyllead, a gasoline additive, is found to contain 38.43 g lead, 17.83 g carbon, and 3.74 g hydrogen. Find its empirical formula.
- A 170.00 g sample of an unidentified compound contains 29.84 g sodium, 67.49 g chromium, and 72.67 g oxygen. Find the empirical formula.
- Determine the molecular formula of the compound with an empirical formula of CH and a formula mass of 78.110 u.
50, 000 J of heat was absorbed by the surroundings when 150 kJ of
work was done by the system.
4mg of NaCl was weighed and topped up to 50ml.
Calculate the concentration of Na in ppm
4mg of NACL was weighed and topped up to 50ml
Calculate the normality of CL-
4mg of NACL was weighed and topped up to 50ml.
Calculate the normality of Cl-
How many moles of N2 reacted if 0.65 mol of NH3 is produced? Please answer in 2 significant figures
