Science Homework Help

What mass is equal to 2 moles of H2O

36 g

18 g

3 g

16 g

2 moles of

O2 equals what mass?

64 g

32 g

8 g

16 g

Why should you not measure more than 100% product?

Measuring more than 100% yield indicates impurities.

Measuring more than 100% yield indicated mathematical or experimental errors.

The conservation of matter states matter cannot be created.

All of the above.

What mass of H2O is produced from 100 g of H2 in the following reaction. 2H2  + O2  → 2H2O

600 g H2O

900 g H2O

300 g H2O

200 g H2O

150 g of NaCl is equal to how many moles?

2 moles

5 moles

58 moles

2.5 moles

if the actual yield of a reaction is 50 g and the theoretical yield is 60 g. What is the percent yield.

25%

50%

60%

83.3%

What is the formula for percent yield?

none of the above

Theoretical yield / Actual yield x 100

Actual yield / Theoretical yield x 100 

Theoretical yield / Actual yield x 100 and Actual yield / Theoretical yield x 100

How many moles of AlCl3 are present in 3.75 grams of AlCl3?

1.1 moles

0.093 moles

0.028 moles

363.75 moles

How many particles of O3 will be produced from 3 moles of NO2?

NO2 + O2 → NO + O3

8.1 x 10^23particles

1.8 x 10^24particles

2.2 x 10^26particles

6.02 x 10^24particles

Given 70 g of Cl2,  how many particles of Br2 is produced?

Cl2 + 2KBr → 2KCl + Br2

1.2 x 10^24 particles

2.06 x 10^23 particles

1.66 x 10^23 particles

6.02 x 10^23 particles