A piece of copper has a volume 300 L. What is the mass of the sample, in units of grams? Fill in the blank red squares. The numerator and denominator of a conversion unit must represent equivalent quantities. For example, 1 L equals 1000 cm3, but not 8.8 g Cu.

A chemist must dilute 53.1 mL of 4.27 M aqueous calcium bromide (CaBr₂) solution until the concentration falls to 2.00 M. She'll do this by adding distilled water to the solution until it reaches a certain final volume. Calculate this final volume, in liters. Be sure your answer has the correct number of significant digits. ☐ 4× 10 L S ? x10 X

the radius of a neon atom is 6.9 x 10 ^-2 nm, and its mass is 3.35 x 10^-17 micrograms. what is the density of the atom in grams per cubic inch (g/in^3) ?

If a sample of unknown substance has a mass of 3.50 kg and a volume of 1.30 L, what is the density of the substance when expressed in conventional (but non-SI) units of g/cm3?

If a sample of gold alloy has a mass of 87.7 g and is 78.3% gold by mass, what percentage of the alloy is made up of other metals? Write your answer to the nearest tenth of a percent. (I had to alter the wording of this question since it wasn't calculating significant figures properly, so if you got it wrong because of significant figures you can assume you probably actually got it correct.)

In some polluted city air the amount of lead was measured at 3.1 x 10^-6 g/m^3. What is the amount of lead in nanograms per cubic centimeter

In 1999, scientists discovered a new class of black holes with masses 100 to 10,000 times the mass of our sun, but occupying less space than our moon. Suppose that one of these black holes has a mass of 8×103 suns and a radius equal to one-half the radius of our moon. What is its density in grams per cubic centimeter? The mass of the sun is 2.0×1030kg and the radius of the moon is 2.16×103mi. (Volume of a sphere =43πr3.)

3. The total volume of seawater is 1.5 x 1021 L. Assume that seawater contains 3.1% NaCl by mass (this means that there are 3.1 g NaCl in 100 g solution) and that its density is 1.03 g/mL, calculate the total mass of NaCl in the seawater in kilograms. Note that 1 kg = 1000 g. 4. Copy the table and fill in the blanks with the appropriate values, symbols and the like: (Note: You can use a periodic table to locate the element.) 5. 6. 7. 8. SYMBOL protons neutrons electrons net charge Which of the following are: (a) SO₂ (b) Sg 5 6 5 Write only the letter of your choice. (c) Cs (d) N₂O5 56 26 A. Molecules but not compounds B. Compounds but not molecules C. Both compounds and molecules Which of the following has more atoms? A. 1.10 g of hydrogen (H) atoms B. 14.7 g of chromium (Cr) atoms 2+ Fe CHEM01-(09-101P) Problem Set No. 1 (e) (f) 0₂ o o Which of the following has a greater mass? A. 2.0 atoms of lead B. 5.1 x 1023 mole lithium 16 18 - 3 79 117 79 (g) CH4 (h) KBr 86 136 0 Write the…

In 1999, scientists discovered a new class of black holes with masses 100 to 10,000 times the mass of our sun, but occupying less space than our moon. Suppose that one of these black holes has a mass of 1×10^3 suns and a radius equal to one-half the radius of our moon. What is its density in grams per cubic centimeter? The mass of the sun is 2.0×10^30 kg and the radius of the moon is 2.16×10^3 mi (Volume of a sphere =4/3πr^3)

According to the label on a bottle of salad dressing, the volume of the contents is 0.362 liter (L). Using only the conversions 1.00 L = 1000. cm^3 and 1 in. = 2.54 cm, express this volume in cubic inches.