1- What is the correct number of significant figures in 0.000197 ?

1- What is the correct number of significant figures in 0.000197?

• 6
• 2
•  7
•  3
•  4

2- 10.53533

35332222

•  3.15E-3 g
•  2.03 g
•  6.10 g
•  0.678 g
• 1.39E3 g

3-

What is the correct answer to the following expression: (879 + 74) × 0.71071?

a. 931.59

b. 677.3066

c. 677

d. 677.307

e. 677.31

4- If 14.8 g N2 and 2.19 g H2 react to produce 1.29 g NH3, what is the percent yield of the reaction? 

    N2(g) + 3 H2(g) → 2 NH3(g)

•  0.105 %
•  7.17 %
• 10.5 %
•  954 %

 14.3 %