How many molecules are in 237 g (about a cup) of water? 1513.1 4267 6.02 times 1

Question

How many molecules are in 237 g (about a cup) of water? 1513.1 4267 6.02 times 1023 (93 Times 1024 7.93 times 10 24 Nitroglycerin has a formula C3Hs(N03)3. The molar mass of nitroglycerin is... 65g. 227g 309g 398g. Consider the following equation: N2 + 3 H2 rightarrow 2NH3. Which of the following statements is NOT true for this equation? 1 L of N2 reacts with 3 L of H2.. 1 mole of N2 reacts with 3 moles of H2. 1 gran: of N2 reacts with 3 grams of H2. 1 molecule of N2 reacts with 3 molecules of H2. A mole is... (a) the number of atoms in exactly12.00 grams of C-12 Avogadros number of particles 6.022X1023 particles all of these represent a mole Balance the following reaction._H2SO4 +_Mg(OH)2 _MgSO4 + _1 What is the coefficient in front of the water? 2 4 1 3 5 Balance the following reaction. _C2H6 + _O2 _CO2 + H2O What is the coefficient in front of the water?2 4 6 3 5 What is the formula weight of NaOH in g/mol ?40 22.98 39 17 If you weighed out 125 grams of PCI3 how many moles of PCI3 would you have? 0.91 5.492 3.4xl03 none of these If you had 0.165 moles of PCI3 how many grams of PCI3 would you have? 2112 8.92 4.7x10-4 22.66 none of these How many moles of chlorine atoms would be in 0.165 moles of PCI3 ?8.92 26.77 1.4x1O-3 0.495 12.-16.In a re action of a flare, 5 grams of magnesium were reacted. How many moles of magnesium were reacted? 0.4 0.8 1.6 0.2 0.1 How many moles of O2 were needed for the reaction? 0.4 0.8 1.6 0.2 0.1 How many grains of O2 were needed for the reaction? 3.2 6.4 12.8 1.6 How many moles of MgO were produced in the reaction? 0.4 0.8 1.6 0.2 0.1 How many grams of MgO were produced in the reaction? 8.0 5.0 1.6 2.5

Explanation / Answer

2.E) 7.93 x 10^ 24

3. b) 227

4. c) 1 gram N2 reacts with 3 gram of H2

5. d) all of these represent a mole

6. a) 2

7. c)6

8. a)40

9. a) 0.91

10. d) 22.66

11 d) 0.495

12 d) 0.2

13. e)0.1

14. a) 3.2

15 d) 0.2

16 a)8

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