One mole is defined as the number of particles equal to the number of atoms in e

Question

One mole is defined as the number of particles equal to the number of atoms in exactly 12 g of carbon-12. the number of particles equal to the number of atoms in exactly 16 g of oxygen-16. the number of particles equal to the number of molecules in 1kg of water. the number of particles equal to the number of atoms in exactly 1 g of hydrogen-1. the number of particles equal to the number of atoms in exactly 1 kg of carbon at the National Bureau of Standards. A sample of water (H_2O) contains 1.81 times 10^24 molecules. How many moles of atoms are there in this sample? 1.00 2.00 3.00 6.00 9.00 How many moles of ammonia arc there in a 346 g sample of pure NH_3 (17.03 g/mol)? 0.0496 mol 20.3 mol 24.7 mol 5930 mol 3.46 mol A gallon of water has a mats of 3.79 kg, How many moles of water is this? 210 mol 0.210 mol 68.3 mol 68, 300 mol 386 mol How many moles of chlorine are in 25.0 g of calcium chloride (CaCl_2)? 0 705 mol 0.451 mol 0.331 mol 0.225 mol 0.676 mol The mass of 1.250 mol of an dement is 88.64 g. What is the element? Ge Sr Br_2 Cl_2 Ga Which statement about the following chemical reaction is NOT correct? 3 H_x(g) + N_2(g) rightarrow 2 NH_3(g) For every two moles of nitrogen consumed, three moles of ammonia arc produced. For every mole of nitrogen consumed, two moles of ammonia are produced. For ever three moles of hydrogen consumed, two moles of ammonia arc produced. For every two moles of ammonia produced, three moles of hydrogen are consumed. Three moles of hydrogen will react with one mole of nitrogen to produce ammonia. Which statement about the following chemical reaction is NOT correct? 3 H_2(g) + N_2(g) rightarrow 2 NH_3(g) For every nitrogen molecule consumed, two molecules of ammonia are produced. For every 6.06 grams of H_2 consumed, 2 moles of NH_3 are produced. If 34.0 grams of NH_3 are produced, 28.0 grams of N_2 were consumed. In order for 56 grams of N_2 to completely react, 18 grams of H_2 would be required. Three moles of nitrogen react with nine moles of hydrogen.

Explanation / Answer

24)

According to definition of SI , the mole is defined as the number of particles equal to number of atoms in exactly 12 g of carbon-12.

So, correct option is (a)

25) 1 mole contians 6.023 x 1023 atoms

So, here we have 1.81 x 1024 atoms

So,number of moles = 1.81 x 1024 atoms /6.023 x 1023 atoms = 3.0 moles

So correct answer is option-(c)

26)

1 mole of ammonia weighs 17 grams

here we have 346 g of ammonia.

So, moles of ammonia =  346 g / 17 g

= 20.3 mol

correct option is (b)

27)

1 mole of water weighs 18 grams

Here we have 3.79 kg = 3790 grams

So. moles of water = 3790 grams/ 18 grams

= 210 moles

correct option is (a)

post remaining questions separately.

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