Chem Exam 5
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- The molas mass of (NH4)2 SO4 is:
- 132g
- The % of Cl in KClO is:
- 29%
- The number of moles in 320g of NaOH is:
- 8
- The empirical formula of a compound with a composition 65.2% Sc and 34.8% O is:
- Sc O
- The empirical formula of a compound 42.9%C and 57.1%O is:
- CO
- The molecular formula of a compound 92.3%C and 7.7%H which weighs 78g/mole is:
- C H
- The mass in grams of one molecule of CO is equal to:
- 7.3 x 10 g
- The molar mass of paradichloroenzene (C H Cl ) is
- 147g
- A compound is 26.8%Cr, 32.9%O and 40.3%K. The formula for this compound is:
- K CrO
- What is the mass of Carbon in 20g of C H ? hint: find % first.
- 16.4g
- If I placed 100 atoms of lead and 100 atoms of copper on a scale, which would weigh more?
- lead
- Which compound has the highest % of Cl
- NaClO
- If I divide a quantity of a compound by the molar mass of that compound I will determine:
- the number of moles
- Moles are proportional to:
- atoms and molecules
- Which of these represents a molecular formula
- C H
- How many molecules are in 1 mole of neon?
- 6.02 x 10
- If I have 3.6 x 10 atoms, how many moles do I have?
- 6 moles
- How many particles does the molar mass of any substance contain?
- 6.02 x 10
- What is the mass of 1 mole of water?
- 18g
- The first step in finding the empirical formula of a compound is to:
- determine the number of moles of each element.
-
When balanced, the co-efficients of this equation are:
KClO = KCl + O - 2, 2, 3
-
When balanced the co-efficients of this equation are:
CH + O = CO + H O - 1,2,1,2
-
When balanced, the co-efficients of this equation are:
H PO + Ca(OH) = Ca (Po ) + H O - 2,3,1,6
- How many moles of water are produced when .67 moles of NaOH H C O + 2NaOH = Na C O + 2H O
- 0.67
- How many grams of aluminum are produced by the decomposition of 125g of Al O ? 2Al O = 4Al +3O
- 66