A sample of an element has a mass of 34.261 grams and a volume of 3.8 cubic centimeters. To which number of significant figures should the calculated density of the sample be expressed?

(1) 5 (3) 3

(2) 2 (4) 4

2. The temperature of CO2 gas at 99.3 mmHg was measured at 455 K. What will be the new temperature if the pressure is adjusted to 202.6 mmHg? Assume constant volume.

Calculate the atomic mass in grams of 0.35 moles of CH4. 0.18 g 5.6 g 45 g

Which element is a solid at STP and a good conductor of electricity? (1) iodine (3) nickel (2) mercury (4) sulfur

The solubility of co2 in water at 1.22 atm is 0.54 g/l. what is the solubility of carbon dioxide at 1.86 atm? assume that temperature is constant.

which of the following steps of the scientific method involves stating a relationship but not proposing an explanation for the relationship? a) hypothesis b) scientific law c) theory d) observation

How many moles of neon (Ne, 20.179 g/mol) are in 68.4 grams of neon

A 50.00 mL sample of groundwater is titrated with 0.0300 M EDTA. Of 12.40 mL of EDTA is required to titrate the 50.00 mL sample, what is the hardness of the groundwater in molarity and in parts per million of CaCO 3 by mass

Why openness is important to the progress of science?

At a certain temperature the rate of this reaction is second order in NH4OH with a rate constant of 34.1 M^-1s^-1: Suppose a vessel contains NH4OH at a concentration of 0.100M.

If you go into the lab and dissolve 2.11 g of magnesium chloride in enough water to make 1500 ml of solution, what is the molarity of the resulting solution?