Using significant digits

Using significant digits

The natural abundance of 2H is 0.015% and that of 18O is 0.20%. How many 2H218O molecules are there in 1.0 moles of water?

An alloy contains 35 g of silver, 4 g of gold, and 23 g of copper. What is the percentage of copper in the alloy? Round off your answer to the tenths place.

Determination of metal contaminant in a powder sample. (Chemistry)

This is for my chemistry homework

A little rusty with the math. School just started back and I need to refresh my memory. Any help would be appreciated.

If 8.3 grams of Fe(III) reacts with 6.3g of Chlorine, what is the final mass of Fe(III)Cl and the limiting reagent?

I want to ask about this science fact

Give the order of increasing certainty for the inverse of each of the following values, none of which is exact (the inverse of x is 1/x). 0.0052, 5.501, 6.45X10^6

Using the balanced equation 3Ba+Al2(SO4)3-->2Al+3BaSO4, how many grams of aluminum will be produced if 4 g of barium react with .45 g of Al2(SO4)3?

When I was looking at a conversion factor everything was looking good until I had to covert mg to grams...is showed 1000 milligrams to 1 gram but yet on charta it's known to be 0.001 grams so why...

I need to know what formula to use and how to calculate the moles of potassium sulfate produced and the grams of water produced

it needs to be solved with dimensional analysis

How do I know ( or assume ) the compounds state of matter in a chemical reaction equation? I get that Ionic and Metallic bond will tend to be in a solid shape on room temperature, though...

An ideal gas (Cp/Cv = γ) is taken through a process in which the pressure and the volume vary as P = KVa. Find the value of a for which the specific heat capacity in the process is zero.

gas laws, conversion factors

750mmHg 0f 30cm3 of a gas at 300c is passed through a tube. If the pressure of the gas at the end of this 530mmHg and the gas, find the new volume at 300c

I really need help with this.

Sodium benzoate is a common food preservative and can be commonly found in the ingredient list of carbonated beverages. Carbonated beverages also contain phosphoric acid and are highly acidic. Explain...

What would be the balanced equation for the synthesis of benzoic acid using the Gignard reagent, phenylmagnesium bromide?