A travel mug of 91∘C coffee is left on the roof of a parked car on a cold winter day. The temperature of the coffee after t minutes is given by H=91 (2) - t/14. After how many minutes will the coffee be only lukewarm (30∘C) ?

Calculate the number of atoms in. (a) 52 moles of He. (b) 52 g of He. (c) 52 u of He

Kilograms represented by the mass defect for oxygen-16: 2.20 * 10 - 28 kg What is the nuclear binding energy for oxygen-16?

What would the temperature of 0.734 moles of chlorine gas be at 1.83 atmospheres in a 10.2 liter container? (R = 0.0821 Latm/molk)

Choose a statement below that is TRUE. A) A solution will form between two substances if the solute-solute interactions are strong enough to overcome the solvent-solvent interactions.

Oxygen is much less soluble in water than carbon dioxide at 0.00412 g / 100 mL at 20°C and 760 mmHg. Calculate the solubility of oxygen gas in water at 20°C and a pressure of 1150 mmHg

Which of the following equilibria would be impacted by a change in pressure? Select the correct answer below: H2 (g) + I2 (g) →2HI (g) NO (g) + O3 (g) →NO2 (g) + O2 (g) 2SO3 (g) →2SO2 (g) + O2 (g) CO (g) + H2O (g) →CO2 (g) + H2

A common stain remover is sold in concentrated form as 3M sodium hypochlorite (NaOCl). You need to create 400 milliliters of a 0.5M solution of sodium hypochlorite to fill a spray bottle. What volume of 3M sodium hypochlorite is needed? 15.0 mL 66.

A chemical reaction that takes in heat is called: exothermic endothermic a phase change

Which of the following lines (of latitude or longitude) would represent by 180 longitude? South Pole Equator Prime meridian North Pole International date line

63Ni decays by a first-order process via the emission of a beta particle. The 63Ni isotope has a half-life of 100. years. How long will it take for 65% of the nickel to undergo decay?