One radioactive isotope of calcium has an atomic mass of 47. How many protons are in this calcium-47 nucleus? A) 17 B) 20 C) 27 D) 47

How many moles of oxygen (O2) are present in 33.6 L of the gas at 1 atm and 0°C? O 1.5 O2 224 O 32

How many milliliters of 0.260 m na2s are needed to react with 35.00 ml of 0.315 m agno3?

omplete the equation showing the reaction of octadecyl p-toluenesulfonate (CH3 (CH2) 16CH2OTs) with sodium butanethiolate (NaSCH2CH2CH2CH3). Click the "draw structure" button to launch the drawing utility. Do not use brackets in your answer.

The pharmacy stocks a 90% w/v solution of drug 'w'. you need to prepare 200ml of a 5mg/ml solution for a patient. what volume of the stock solution will you need?

Which properties are most useful for identifying minerals? Why?

1 75 ml of lemon juice are added to 50 ml of water. What is the percent by vo of the solute?

How many moles of tungsten atoms are in 4.8 x 1025 atoms of tungsten?

At what speeds do you criuse down the track of a roller coaster

A sample of hydrogen gas is mixed with water vapor. The mixture has a total pressure of 755 torr and the water vapor has a partial pressure of 24 torr. What amount (in moles) of hydrogen gas is contained in 1.55 L of this mixture at 298 K?

Both equation I and II are balanced, but equation II is the correct way to write the balanced equation. Why do you think this is? (Hint: Think fractions.) I) 2 SnO2 + 4 H2 → 2 Sn + 4 H2O II) SnO2 + 2 H2 → Sn + 2 H2O