From Questions to Solutions

How many moles of methane are produced when 36.6 moles of carbon dioxide gas react with excess hydrogen gas? Express your answer with the appropriate units.

Calculate the molar mass of the unknown compound. An aqueous solution containing 36.9 g of an unknown molecular (non-electrolyte) compound in 153.4 g of water was found to have a

The vapor pressure of ethanol is 102 mmHg at 41.3°C. What is its vapor pressure at 79.6°C? The molar heat of vaporization of ethanol is 39.3 kJ/mol.

Two lamps, one rated 100 W at 220 V and the other 200 W at 220 V, are connected: (i) in series and (ii) in parallel to the electric main

Find small b if A= 2358.85, h= 38.2 and B= 45.6

Boxing Chocolates The Chocoholic Chocolate Company wants to create three different boxes of chocolates for Valentine’s Day with 20, 32, and 36 chocolates in each box. The chocolates will be

The length of the red ribbon is [tex]$7 - m$[/tex] more than the blue ribbon, while the length of the green ribbon is [tex]$5$[/tex] m less than the blue ribbon.

A 39.3 g glass thermometer reads [tex]22.0^\circ\text{C}[/tex] before it is placed in 136 mL of water. When the water and thermometer come to equilibrium, the thermometer reads [tex]43.6^\circ\text{C}[/tex]. What was

A racing car consumes a mean of 99 gallons of gas per race with a standard deviation of 3 gallons. If 37 racing cars are randomly selected, what is the

An elderly woman is hospitalized with pneumonia and anemia and has a history of heart failure. She is weak and has a poor cough effort. Her current vital signs are:

This data is from a sample. Calculate the mean, standard deviation, and variance. Suggestion: use technology. Round answers to two decimal places. x 39.3 38.2 11.7 40.1 23.5 42.6 15

A race car entering the curved part of the track drops its speed from 45.1 m/s to 36.6 m/s in 2.99 seconds.

Palak has two ribbon rolls of lengths 60 cm and 80 cm. She wants to cut them into pieces of equal length such that there is no ribbon left at

What is the mass in grams of 1.73 moles of CaH₂? A. 42.3 g B. 72.5 g C. 39.4 g D. 62.1 g

After the journalism club sold 60 magazines, it had [tex]$220[/tex] in profit. After it sold a total of 100 magazines, it had a total of [tex]$420[/tex] in profit. Which equation