How many molecules are present in a sample of oxygen gas with a mass of 3.2 grams

What is the empirical formula of a molecule containing 18.7% lithium, 16.3% carbon, and 65% oxygen?

Which two types of muscles are not voluntary? cardiac and smooth muscles skeletal and cardiac muscles smooth and skeletal muscles all of the above

Which materials has magnetic domains and can be made into a magnet? (A) Plastic (B) An iron nail (C) An aluminum can (D) A glass bottle

Why is RNA chemically unstable?

Which of the following is true about population distribution? A) Regular distribution is the most common type of population distribution. B) Random distribution occurs due to interactions with other individuals.

A 75.00 g a sample of a substance is analyzed and found to consist of 32.73 g phosphorus and 42.7 g oxygen. calculate the percent composition of this substance.

Which one of the following melts the fastest: rectangular prism, cylinder, and rectangular trapezoidal trough?

A 1.8-mL volume of seawater contains about 4.0 * 10^-10 g of gold. The total volume of ocean water is about 1.5 * 10^21 L. Calculate the total worth of all the gold in the world's oceans if the price of gold is $19.

Why are numbers placed before the elements and molecules in a chemical equation?

Which of these pairs of elements have the same number of valence electrons? oxygen (O) and bromine (Br) selenium (Se) and bromine (Br) carbon (C) and lead (Pb) oxygen (O) and carbon (C) sodium (Na) and magnesium (Mg)