15 questions
A student measures 25.5g of sodium chloride on a balance for a lab. The student realizes that she needs an additional sodium chloride, but measures it on a different balance and records the mass as 6.29g. To the correct number of significant figures, how many total grams of sodium chloride did the student add?
31.79g
31.8g
32g
30g
Aqueous sodium chromate and lead(II) nitrate are combined and a double replacement reaction occurs. Which of the following is one of the products that forms?
PbCrO4
Pb2CrO4
Pb(CrO4)2
Pb3(CrO4)2
Copper(II) hydroxide is used widely in the aquarium industry for its ability to destroy external parasites in fish. What is the IUPAC formula for copper(II) hydroxide?
Cu(OH)
Cu(OH)2
Cu2(OH)
Cu2(OH)2
3 H2(g) + N2(g) → 2 NH3(g)
Calculate the maximum amount of NH3 that could be produced from 1.40moles of hydrogen and excess nitrogen.
15.8984g
15.9g
35.7714g
35.8g
The number of significant figures in the measurement 0.050860m is
3
4
5
6