If 100g of propane reacts with 1000g of oxygen, mole fraction of `CO_2` at end?

100 g of propane is completely reacted with 1000 g of oxygen. The mole fraction of carbon dioxide in the resulting mixture is "x" xx 10^(-2) The value of x is ______ . (Nearest integer) [Atomic weight : H=1.008, C=12.00, O=16.00]

Convert 12 g of oxygen gas into moles.

10 g hydrogen is reacted with 64 g of oxygen. The amount of water formed will be (in moles)

6g .of Urea is dissolved in 90g .of water.The mole fraction of solute is

Four different experiments were conducted in the following ways: I. 3 g of carbon was burnt in 8 g of oxygen to give 11 g of CO_2 . 1.2 g of carbon was burnt in air to give 4.2 g of CO_2 . III. 4.5 g of carbon was burnt in enough air to give 11 g of CO_2 IV. 4 g of carbon was burnt in oxygen to form 30.3 g of CO_2 . Law of constant proportions is not illustrated in experiment(s)

If 8.5 g of hexane burns completely in oxygen, how many moles of CO_(2) is/are produced?