Chemistry, 20.01.2020 17:31 haleyrene3924

Calculate the molar mass for sodium sulfate, n a2so4. a sample of sodium sulfate with a mass of 300.0 g represents what number of moles of sodium sulfate?

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Answer from: h2o12

300 grams of sodium sulfate represents 2.112 moles

Explanation:

Step 1: Data given

Mass of Na2SO4 = 300.0 grams

Step 2: Calculate the molar mass of Na2SO4

Na = 22.99 g/mol

S = 32.065 g/mol

O = 16 g/mol

Molar mass of Na2SO4 = 2*22.99 + 32.065 + 4*16

Molar mass of Na2SO4 = 142.045

Step 3: Calculate moles of Na2SO4

Moles Na2SO4 = mass Na2SO4 / molar mass Na2SO4

Moles Na2SO4 = 300.0 grams / 142.045 g/mol

Moles Na2SO4 = 2.112 moles

300 grams of sodium sulfate represents 2.112 moles

Answer from: Quest

Ibelieve its a because an empirical formula usually has a ch in it your options are a or b
Which of these is an empirical formula?

Answer from: Quest

Answer: abeexplanation:

1. the question asks the most appropriate, which seems to rule out "all of the above." your choice appears to be the correct one.

2. the protocol described is good for identifying correlation, but not cause and effect. for cause/effect, you need to devise a protocol that will assign the treatment (or not) to groups that have essentially the same "demographics" with respect to all the other variables. your choice regarding control group seems appropriate. random assignment of treatment (choice d) may be appropriate also. (i think you can argue that b and d are just different descriptions of the same method.)

3. d will randomize the birds, but may not guarantee there are 10 in each group. e will do both, so seems the better choice.

comment on question 2

based on the problem statement, it seems clear that confident, attentive drivers are more likely to use daytime running lights. so, the protocol might need to be devised in such a way that the lights would be turned on or off without the driver's knowledge. (an attentive driver will figure it out.) assigning a confident, attentive driver to a group required to drive without running lights might mess with his/her confidence and attentiveness. you don't want your experiment to do that. (nor do you want the experiment to subject a driver to greater risk of accident as a consequence of driving without running lights.) experiments involving human safety are always problematic.

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Calculate the molar mass for sodium sulfate, n a2so4. a sample of sodium sulfate with a mass of 300....

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