A star is estimated to have a mass of 2 x 1036 kg. Assuming it to be a sphere of average radius 7.0 x 105 km, calculate the average density of the star in units of grams per cubic centimeter.

Q: The population density of worms in a particular field is 34 worms per cubic meter of soil. How many…

A: The volume of soil is calculated as,

Q: The distance between the centers of two oxygen atoms in an oxygen molecule is 1.21 x 10- cm What is…

A: The relation between cm and nm is - 1 cm = 1 x 107 nm

Q: If a block of copper measures 2.00cm x 4.00 x 5.00cm and weighs 356g, what is the density of the…

A: => Volume of copper block = (2.00 cm x 4.00 cm x 5.00 cm ) = 40.0 cm3

Q: The concentration of mercury in a polluted lake is 0.33 micrograms per liter of water. What is the…

A: Given,Volume of the lake = 1.5 x 1012cm30.33 micrograms per liter of water

Q: If mercury (density = 13.6 g/cm3) at a height of 895 mm Hg in a mercury barometer is replaced with…

A: According to Boyle's law temperature remaining constant ,the volume of a given mass of a gas is…

Q: The density of ethylene glycol, the principal ingredient in antifreeze is 1.11 g/cm3.  If you have…

A: For Ehtylene Glycol liquid,  Density = 1.11 g cm-3 Mass = 245 g Volume = ?

Q: The speed of light is 2.998 × 10° m/s. How long does it take light to travel 30. cm? Set the math…

A: Given, the speed of light =2.998×108 mswe are asked to calculate the time required to travel 30 cm

Q: Under certain conditions, the density of dry air is 1.205 g/L. What is the mass of air in a room…

A:

Q: Mercury metal is poured into a graduated cylinder to exactly 22.5 mL. The mercury used to fill the…

A: Given information: Volume = 22.5 mL Mass of empty graduated cylinder = 12.0 g Mass of mercury +…

Q: If a sample of unknown substance has a mass of 3.10 kg and a volume of 1.80 L, what is the density…

A:

Q: The density of iron is 7.87 g/mL. What is the mass of a 2.00 cm x 4.00 cm x 1.00 cm block of iron?…

A:

Q: A piece of aluminum foil has a mass of 0.200g and measures 5.00cm by 2.15cm^3. If the density of…

A: Given,Mass of aluminium foil = 0.200 gDensity of aluminium foil = 2.70 g/cm3The volume of the…

Q: High-density lipoprotein (HDL) is a type of cholesterol, sometimes called “good cholesterol,” that…

A: Density is given by the ratio of the mass of the substance to that of the volume.

Q: A student is given the following question: "What is the mass of a gold bar that is 7.379 x 1o 4m3 in…

A:

Q: What is the volume, in L, of a room that is 8.00 ft x 10.00 ft x 10.0 ft?

A: The volume in liters has to be determined. Some of the common conversion factors that will be useful…

Q: A rectangular piece of platinum has dimensions of 3.50 cm x 2.16 cm x 1.08 cm and weighs 175.5 g.…

A: Formula: Density ( D) = Mass (M)  \ Volume (V)

Q: A student measured the length and mass measurements of a cube using the same equipment as in the…

A: Density=MassVolume

Q: Given that the air in a building has a density of 1.184 × 10-3 g/cm3, how much does the air weigh…

A: room is rectangular in shape  width = 30.0 feet and 7.0 inches = 30.584 feet  length =41.0 feet…

Q: The population density of worms in a particular field is 33 worms per cubic meter of soil. How many…

A: Given dimensions of field = 1 km × 1.5 km density of worms = 33 worm per cubic meter of soil

Q: A block of iron (density = 7.87 g/cm³) has dimensions of 4.25 cm x 5.80 in x 1.48 ft. Calculate its…

A: Given,  The density of a block of iron is 7.87 g/cm3, The mass of block of iron when it has…

Q: The density of human urine is normally between 1.003 and 1.030 g/mL, and is often used as a…

A: The density of human urine is normally 1.003 to 1.030 g/mL 25 ml of urine has 26.875 g weight

Q: a thin sheet of lead measures 15.5 cm by 23.0 cm and weighs 0.627 g. if the density of lead is 11.34…

A: Given information is as follows: Length of the lead sheet = 15.5 cm Width of the lead sheet = 23.0…

Q: Jupiter’s mass is estimated to be 1.90 x 1027 kg, and it has a diameter of 142,984 km. Assuming that…

A: Density (d) , mass (m) and volume (V) are related as:

Q: 2. The density of Zinc is 7.13 g/cm³. What is the volume of a sheet of zinc that is 45cm by 60cm in…

A: Given information,   Density of Zinc = 7.13 g/cm3   Area is 45 cm x 60 cm and thickness is 0.0155 cm

Q: A material will float on the surface of a liquid if the material has a density less than that of the…

A: Given: Density of water = 1.0 g/mL Volume = 1.2 × 104 in3 Mass = 3.5lb

Q: A star is estimated to have a mass of 2 x 10 kg. Assuming it to be a sphere of avera radius 7.0 x…

A: Given data: Mass of star = 2 * 1036 kg, Radius = 7.0 * 105 km The star is assumed as circle thus,…

Q: One molecule of the spherically shaped, oxygen-carrying protein in red blood cells, hemoglobin, has…

A: Given: Diameter of the oxygen carrying cells = 5.5nm To Find: Diameter of the cell in meter Formula:…

Q: After taking measurements of a rectangular solid with a mass of 3.84g, you determined the length to…

A:

Q: If a block of copper measures 2.00 cm x 4.00 cm x 5 cm and weighs 356 g, what is its density?

A: The mass per unit volume of a substance is known as the density of the substance. The density of a…

Q: 2. You purchase a rectangular piece of metal that has  dimensions 5.0 X 15.0 X 30.0 mm and mass…

A: A numerical problem based on measurement, which is to be accomplished.

Q: The density of air at ordinary atmospheric pressure and 25 degrees Celsius is 1.19 g/L. What is the…

A: Given that density of air = 1.19g/L  Dimensions of room = 14.5*16.5*8.0 feet

Q: A piece of silver metal weighing 194.3 gramas is placed in a graduated cylinder containing 242.0 mL…

A: Given;

Q: The density of aluminum is 2.70 g/cm3. if 10.00 g of aluminum pellets is added to a graduated…

A: Density is a measure of mass per unit volume. The average density of an object equals its total mass…

Q: A student is given the following question: "What is the mass of a gold bar that is 7.379 × 10–4 m3…

A: We know,Mass = Density x Volume

Q: A sample of gold foil is 9.5cm by 12cm. If the mass of the foil is measured to be 10.56g and the…

A:

Q: A rectangle lead apron is placed over the chest of a patient while X-rays are taken in a dental…

A: The volume of the rectangle is calculated as shown below where l, w, and h are the length, width,…

Q: A. A typical cheese contains 30.17% water, 31.23% protein, 34.39% fat by mass and the rest made up…

A: We have to predict the mineral water content, volume occupied.

Q: Molecular distances are given in nano-meters, where 1nm is equivalent to 1 x 10-9 meter. If the…

A:

Q: he volume occupied by the egg whites from four “large” eggs is 112 mL. The mass of the egg whites…

A: Given : volume of 4 egg whites = 112 mL And mass of 4 egg whites = 120 g

Q: The density of mineral oil is 0.834 g/mL. What is the mass in kg of the mineral oil in a cubic…

A: Given that: density of oil = 0.834 g/mL side of a cube = 11 inches. To find: The mass in Kg of…

Q: A sample of tap water contains 1.95 x 103 ppm CaCO3(aq). Assuming the density of tap water is…

A:

Q: A piece of metal weighing 305.5 g is placed in a graduated cylinder containing 241.3 mL of water.…

A: Mass of the metal = 305.5 gVolume of the metal = volume of the water displaced = 269.5 mL – 241 mL =…

Q: At 25.0 ºC the density of dichloromethane is 1.325 x 103 kg / m3. If 10.0g of dichloromethane at…

A: Density is defined as “given mass of a substance per unit volume of the container it is placed in”.…

Q: An aluminum cylinder is 10.0cm in length and has a radius of 0.25cm. If the mass of a single Al atom…

A: Length of aluminium cylinder = h = 10cm Radius = r = 0.25cm Mass of single Al atom = 4.48x10^-23 g…

Q: If a sample of unknown substance has a mass of 3.50 kg and a volume of 1.30 L, what is the density…

A: Given : Mass of substance = 3.50 Kg = 3500 g…

Q: Suppose you are trying to find the volume of a box based on the given measurements for the length,…

A: Length of the box,l  = 2.20 in Width of the box, b= 3.91 in Height of the box , h = 10.4 in + 1 in…

Q: When 89.329 g of an irregularly shaped sample of cobalt was placed in a container and filled to the…

A: Given: Total volume of liquid = 25.00 mL. Mass of Cobalt = 89.329 g. Mass of cobalt with ethyl…

Q: block of lead has dimensions of 4.50 cm by 5.20 cm by 6.00 cm . The block weighs 1591g. From this…

A: Given that: Mass of lead block = 1591 g  Dimension of lead block = 4.50cm×5.20cm×6.00cm So, volume…

Q: Gold can be hammered into extremely thin sheets called gold leaf. A 200-mg piece of gold (density =…

A: Given that: Mass of the gold piece = 200 mg The density of gold = 19.32 g/cm3 Measurement of the…

Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.