The molar mass of an insecticide, dibromoethane, is 187.9. Its molecular formula is C2H4Br2. How many atoms of carbon are in a sample of dibromoethane weighing [m] g?
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When 19.8 g C2H6 and [m] g O2 react to form CO2 and H2O, how…
When 19.8 g C2H6 and [m] g O2 react to form CO2 and H2O, how many grams of water are formed? Make sure you balance the equation first. C2H6 + O2 → CO2 + H20
A sample of an element with a mass of [m] g was dropped in a…
A sample of an element with a mass of [m] g was dropped in a graduated cylinder containing 22.30 mL water. The volume of the water plus the sample was [v] mL. What is the density of the element?
A scientist obtains the number 0.045006700 on a calculator….
A scientist obtains the number 0.045006700 on a calculator. If this number actually has four (4) significant figures, how should it be written?
As part of the calibration of a new laboratory balance, a 1….
As part of the calibration of a new laboratory balance, a 1.000-g mass is weighed with the following results: Trial …. Mass 1 ……… 1.201 ± 0.001 2 ………..1.202 ± 0.001 3 ………..1.200 ± 0.001 The balance is:
Which of the following hormones is primarily responsible for…
Which of the following hormones is primarily responsible for increasing glucose availability during prolonged exercise?
A [m]-g sample of HF is dissolved in water to give [v] mL of…
A [m]-g sample of HF is dissolved in water to give [v] mL of solution. The concentration of the solution is: (answer in molarity)
In what manner does the body primarily utilize protein durin…
In what manner does the body primarily utilize protein during exercise?
The density of liquid chloroform is [d] g/mL. What is its de…
The density of liquid chloroform is [d] g/mL. What is its density in units of lb/in3? (2.54 cm = 1 in., 2.205 lb = 1 kg)
What is the main end product of anaerobic glycolysis?
What is the main end product of anaerobic glycolysis?